21255425156501 has 8 divisors (see below), whose sum is σ = 22595408607744. Its totient is φ = 19925404408000.

The previous prime is 21255425156491. The next prime is 21255425156503. The reversal of 21255425156501 is 10565152455212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21255425156501 - 2³⁰ = 21254351414677 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 (21255425156503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2490671285 + ... + 2490679818.

It is an arithmetic number, because the mean of its divisors is an integer number (2824426075968).

Almost surely, 2^{21255425156501} is an apocalyptic number.

It is an amenable number.

21255425156501 is a deficient number, since it is larger than the sum of its proper divisors (1339983451243).

21255425156501 is a wasteful number, since it uses less digits than its factorization.

21255425156501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4981351371.

The product of its (nonzero) digits is 600000, while the sum is 44.

The spelling of 21255425156501 in words is "twenty-one trillion, two hundred fifty-five billion, four hundred twenty-five million, one hundred fifty-six thousand, five hundred one".