253561426021 has 16 divisors (see below), whose sum is σ = 273755871360. Its totient is φ = 234133986240.

The previous prime is 253561425991. The next prime is 253561426031. The reversal of 253561426021 is 120624165352.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253561426021 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 (253561426031) 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, 4353931 + ... + 4411783.

It is an arithmetic number, because the mean of its divisors is an integer number (17109741960).

Almost surely, 2^253561426021 is an apocalyptic number.

It is an amenable number.

253561426021 is a deficient number, since it is larger than the sum of its proper divisors (20194445339).

253561426021 is a wasteful number, since it uses less digits than its factorization.

253561426021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64476.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 253561426021 in words is "two hundred fifty-three billion, five hundred sixty-one million, four hundred twenty-six thousand, twenty-one".