21250406563005 has 64 divisors (see below), whose sum is σ = 34986038250240. Its totient is φ = 11009779200000.

The previous prime is 21250406562877. The next prime is 21250406563019. The reversal of 21250406563005 is 50036560405212.

It is not a de Polignac number, because 21250406563005 - 2⁷ = 21250406562877 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 236068005 + ... + 236158005.

It is an arithmetic number, because the mean of its divisors is an integer number (546656847660).

Almost surely, 2^{21250406563005} is an apocalyptic number.

It is an amenable number.

21250406563005 is a deficient number, since it is larger than the sum of its proper divisors (13735631687235).

21250406563005 is a wasteful number, since it uses less digits than its factorization.

21250406563005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93262.

The product of its (nonzero) digits is 216000, while the sum is 39.

Adding to 21250406563005 its reverse (50036560405212), we get a palindrome (71286966968217).

The spelling of 21250406563005 in words is "twenty-one trillion, two hundred fifty billion, four hundred six million, five hundred sixty-three thousand, five".