1221253035 has 16 divisors (see below), whose sum is σ = 1957270560. Its totient is φ = 650246400.

The previous prime is 1221253031. The next prime is 1221253051. The reversal of 1221253035 is 5303521221.

It is a happy number.

It is not a de Polignac number, because 1221253035 - 2² = 1221253031 is a prime.

It is a super-2 number, since 2×1221253035² = 2982917950993422450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221252996 and 1221253014.

It is not an unprimeable number, because it can be changed into a prime (1221253031) 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 15 ways as a sum of consecutive naturals, for example, 58720 + ... + 76749.

It is an arithmetic number, because the mean of its divisors is an integer number (122329410).

Almost surely, 2^1221253035 is an apocalyptic number.

1221253035 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1221253035 is a deficient number, since it is larger than the sum of its proper divisors (736017525).

1221253035 is a wasteful number, since it uses less digits than its factorization.

1221253035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136078.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 1221253035 is about 34946.4309336447. The cubic root of 1221253035 is about 1068.8954260574.

Adding to 1221253035 its reverse (5303521221), we get a palindrome (6524774256).

The spelling of 1221253035 in words is "one billion, two hundred twenty-one million, two hundred fifty-three thousand, thirty-five".