1242222021 has 16 divisors (see below), whose sum is σ = 1841011200. Its totient is φ = 827841024.

The previous prime is 1242222017. The next prime is 1242222029. The reversal of 1242222021 is 1202222421.

1242222021 is a `hidden beast` number, since 1 + 2 + 422 + 220 + 21 = 666.

It is not a de Polignac number, because 1242222021 - 2² = 1242222017 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1242221985 and 1242222003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242222029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83845 + ... + 97541.

It is an arithmetic number, because the mean of its divisors is an integer number (115063200).

Almost surely, 2^1242222021 is an apocalyptic number.

It is an amenable number.

1242222021 is a deficient number, since it is larger than the sum of its proper divisors (598789179).

1242222021 is a wasteful number, since it uses less digits than its factorization.

1242222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17065 (or 17059 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 1242222021 is about 35245.1701797565. The cubic root of 1242222021 is about 1074.9784083639.

Adding to 1242222021 its reverse (1202222421), we get a palindrome (2444444442).

It can be divided in two parts, 12422 and 22021, that added together give a palindrome (34443).

The spelling of 1242222021 in words is "one billion, two hundred forty-two million, two hundred twenty-two thousand, twenty-one".