21260248025 has 24 divisors (see below), whose sum is σ = 28184517504. Its totient is φ = 15852268800.

The previous prime is 21260248021. The next prime is 21260248067. The reversal of 21260248025 is 52084206212.

It is not a de Polignac number, because 21260248025 - 2² = 21260248021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21260247982 and 21260248000.

It is not an unprimeable number, because it can be changed into a prime (21260248021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 199061 + ... + 286610.

It is an arithmetic number, because the mean of its divisors is an integer number (1174354896).

Almost surely, 2^21260248025 is an apocalyptic number.

21260248025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21260248025 is a deficient number, since it is larger than the sum of its proper divisors (6924269479).

21260248025 is a wasteful number, since it uses less digits than its factorization.

21260248025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485801 (or 485796 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 32.

The spelling of 21260248025 in words is "twenty-one billion, two hundred sixty million, two hundred forty-eight thousand, twenty-five".