21525354501 has 24 divisors (see below), whose sum is σ = 33399036000. Its totient is φ = 12295497312.

The previous prime is 21525354493. The next prime is 21525354541. The reversal of 21525354501 is 10545352512.

It is not a de Polignac number, because 21525354501 - 2³ = 21525354493 is a prime.

It is a super-3 number, since 3×21525354501³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21525354541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 377470 + ... + 430736.

It is an arithmetic number, because the mean of its divisors is an integer number (1391626500).

Almost surely, 2^21525354501 is an apocalyptic number.

21525354501 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21525354501 is a deficient number, since it is larger than the sum of its proper divisors (11873681499).

21525354501 is a wasteful number, since it uses less digits than its factorization.

21525354501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56033 (or 56026 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 33.

The spelling of 21525354501 in words is "twenty-one billion, five hundred twenty-five million, three hundred fifty-four thousand, five hundred one".