21250253435105 has 32 divisors (see below), whose sum is σ = 25753285628928. Its totient is φ = 16832424716800.

The previous prime is 21250253435101. The next prime is 21250253435161. The reversal of 21250253435105 is 50153435205212.

It is not a de Polignac number, because 21250253435105 - 2² = 21250253435101 is a prime.

It is a super-2 number, since 2×21250253435105² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21250253435101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 454751252 + ... + 454797978.

It is an arithmetic number, because the mean of its divisors is an integer number (804790175904).

Almost surely, 2^{21250253435105} is an apocalyptic number.

It is an amenable number.

21250253435105 is a deficient number, since it is larger than the sum of its proper divisors (4503032193823).

21250253435105 is a wasteful number, since it uses less digits than its factorization.

21250253435105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49057.

The product of its (nonzero) digits is 180000, while the sum is 38.

The spelling of 21250253435105 in words is "twenty-one trillion, two hundred fifty billion, two hundred fifty-three million, four hundred thirty-five thousand, one hundred five".