21515410552051 has 8 divisors (see below), whose sum is σ = 23170526288000. Its totient is φ = 19860306838272.

The previous prime is 21515410552043. The next prime is 21515410552063. The reversal of 21515410552051 is 15025501451512.

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 21515410552051 - 2³ = 21515410552043 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21515410552051.

It is not an unprimeable number, because it can be changed into a prime (21515410552091) 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, 899326 + ... + 6621148.

It is an arithmetic number, because the mean of its divisors is an integer number (2896315786000).

Almost surely, 2^{21515410552051} is an apocalyptic number.

21515410552051 is a deficient number, since it is larger than the sum of its proper divisors (1655115735949).

21515410552051 is a wasteful number, since it uses less digits than its factorization.

21515410552051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6011085.

The product of its (nonzero) digits is 50000, while the sum is 37.

The spelling of 21515410552051 in words is "twenty-one trillion, five hundred fifteen billion, four hundred ten million, five hundred fifty-two thousand, fifty-one".