21525553020 has 48 divisors (see below), whose sum is σ = 60391457280. Its totient is φ = 5728727616.

The previous prime is 21525553019. The next prime is 21525553039. The reversal of 21525553020 is 2035552512.

It is a super-2 number, since 2×21525553020² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 326440 + ... + 386799.

It is an arithmetic number, because the mean of its divisors is an integer number (1258155360).

Almost surely, 2^21525553020 is an apocalyptic number.

21525553020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21525553020 is an abundant number, since it is smaller than the sum of its proper divisors (38865904260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21525553020 is a wasteful number, since it uses less digits than its factorization.

21525553020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713754 (or 713752 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 30.

The spelling of 21525553020 in words is "twenty-one billion, five hundred twenty-five million, five hundred fifty-three thousand, twenty".