21501435040525 has 12 divisors (see below), whose sum is σ = 29085577582464. Its totient is φ = 15637407302000.

The previous prime is 21501435040493. The next prime is 21501435040571. The reversal of 21501435040525 is 52504053410512.

It is not a de Polignac number, because 21501435040525 - 2⁵ = 21501435040493 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 39093517981 + ... + 39093518530.

It is an arithmetic number, because the mean of its divisors is an integer number (2423798131872).

Almost surely, 2^{21501435040525} is an apocalyptic number.

21501435040525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21501435040525 is a deficient number, since it is larger than the sum of its proper divisors (7584142541939).

21501435040525 is a wasteful number, since it uses less digits than its factorization.

21501435040525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78187036532 (or 78187036527 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 37.

The spelling of 21501435040525 in words is "twenty-one trillion, five hundred one billion, four hundred thirty-five million, forty thousand, five hundred twenty-five".