1242221535 has 64 divisors (see below), whose sum is σ = 2401660800. Its totient is φ = 606652416.

The previous prime is 1242221531. The next prime is 1242221537. The reversal of 1242221535 is 5351222421.

1242221535 is a `hidden beast` number, since 124 + 2 + 2 + 2 + 1 + 535 = 666.

It is not a de Polignac number, because 1242221535 - 2² = 1242221531 is a prime.

It is a super-2 number, since 2×1242221535² = 3086228684035512450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1242221499 and 1242221508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242221531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 77601 + ... + 92229.

It is an arithmetic number, because the mean of its divisors is an integer number (37525950).

Almost surely, 2^1242221535 is an apocalyptic number.

1242221535 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1242221535 is a deficient number, since it is larger than the sum of its proper divisors (1159439265).

1242221535 is a wasteful number, since it uses less digits than its factorization.

1242221535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14697 (or 14691 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 1242221535 is about 35245.1632851942. The cubic root of 1242221535 is about 1074.9782681743.

Adding to 1242221535 its reverse (5351222421), we get a palindrome (6593443956).

The spelling of 1242221535 in words is "one billion, two hundred forty-two million, two hundred twenty-one thousand, five hundred thirty-five".