21025423203215 has 32 divisors (see below), whose sum is σ = 25455569711616. Its totient is φ = 16670638391680.

The previous prime is 21025423203181. The next prime is 21025423203289. The reversal of 21025423203215 is 51230232452012.

It is not a de Polignac number, because 21025423203215 - 2⁶ = 21025423203151 is a prime.

It is a super-2 number, since 2×21025423203215² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2599899902 + ... + 2599907988.

It is an arithmetic number, because the mean of its divisors is an integer number (795486553488).

Almost surely, 2^{21025423203215} is an apocalyptic number.

21025423203215 is a deficient number, since it is larger than the sum of its proper divisors (4430146508401).

21025423203215 is a wasteful number, since it uses less digits than its factorization.

21025423203215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12799.

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 21025423203215 its reverse (51230232452012), we get a palindrome (72255655655227).

The spelling of 21025423203215 in words is "twenty-one trillion, twenty-five billion, four hundred twenty-three million, two hundred three thousand, two hundred fifteen".