21010525451 has 8 divisors (see below), whose sum is σ = 22119283200. Its totient is φ = 19902061800.

The previous prime is 21010525447. The next prime is 21010525483. The reversal of 21010525451 is 15452501012.

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 21010525451 - 2² = 21010525447 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21010525451.

It is not an unprimeable number, because it can be changed into a prime (21010525411) 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, 81530 + ... + 220608.

It is an arithmetic number, because the mean of its divisors is an integer number (2764910400).

Almost surely, 2^21010525451 is an apocalyptic number.

21010525451 is a deficient number, since it is larger than the sum of its proper divisors (1108757749).

21010525451 is a wasteful number, since it uses less digits than its factorization.

21010525451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147049.

The product of its (nonzero) digits is 2000, while the sum is 26.

The spelling of 21010525451 in words is "twenty-one billion, ten million, five hundred twenty-five thousand, four hundred fifty-one".