21258700753895 has 16 divisors (see below), whose sum is σ = 28581722490528. Its totient is φ = 15043011834240.

The previous prime is 21258700753891. The next prime is 21258700753897. The reversal of 21258700753895 is 59835700785212.

It is not a de Polignac number, because 21258700753895 - 2² = 21258700753891 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 (21258700753891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5223265964 + ... + 5223270033.

It is an arithmetic number, because the mean of its divisors is an integer number (1786357655658).

Almost surely, 2^{21258700753895} is an apocalyptic number.

21258700753895 is a deficient number, since it is larger than the sum of its proper divisors (7323021736633).

21258700753895 is a wasteful number, since it uses less digits than its factorization.

21258700753895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10446536050.

The product of its (nonzero) digits is 42336000, while the sum is 62.

The spelling of 21258700753895 in words is "twenty-one trillion, two hundred fifty-eight billion, seven hundred million, seven hundred fifty-three thousand, eight hundred ninety-five".