252120022421 has 4 divisors (see below), whose sum is σ = 256393243200. Its totient is φ = 247846801644.

The previous prime is 252120022393. The next prime is 252120022423. The reversal of 252120022421 is 124220021252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-252120022421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252120022423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2136610301 + ... + 2136610418.

It is an arithmetic number, because the mean of its divisors is an integer number (64098310800).

Almost surely, 2^252120022421 is an apocalyptic number.

It is an amenable number.

252120022421 is a deficient number, since it is larger than the sum of its proper divisors (4273220779).

252120022421 is an equidigital number, since it uses as much as digits as its factorization.

252120022421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4273220778.

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 252120022421 its reverse (124220021252), we get a palindrome (376340043673).

The spelling of 252120022421 in words is "two hundred fifty-two billion, one hundred twenty million, twenty-two thousand, four hundred twenty-one".