21226540452525 has 36 divisors (see below), whose sum is σ = 38500346822080. Its totient is φ = 11177520026400.

The previous prime is 21226540452517. The next prime is 21226540452553. The reversal of 21226540452525 is 52525404562212.

21226540452525 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 6 + 540 + 4 + 52 + 52 + 5 = 666.

It is not a de Polignac number, because 21226540452525 - 2³ = 21226540452517 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 597071971 + ... + 597107520.

Almost surely, 2^{21226540452525} is an apocalyptic number.

21226540452525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21226540452525 is a deficient number, since it is larger than the sum of its proper divisors (17273806369555).

21226540452525 is a wasteful number, since it uses less digits than its factorization.

21226540452525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1194179586 (or 1194179578 counting only the distinct ones).

The product of its (nonzero) digits is 1920000, while the sum is 45.

The spelling of 21226540452525 in words is "twenty-one trillion, two hundred twenty-six billion, five hundred forty million, four hundred fifty-two thousand, five hundred twenty-five".