20521214550 has 36 divisors (see below), whose sum is σ = 55133664300. Its totient is φ = 5472323760.

The previous prime is 20521214513. The next prime is 20521214557. The reversal of 20521214550 is 5541212502.

20521214550 is a `hidden beast` number, since 205 + 2 + 1 + 2 + 1 + 455 + 0 = 666.

It is a super-2 number, since 2×20521214550² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20521214557) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 22800900 + ... + 22801799.

It is an arithmetic number, because the mean of its divisors is an integer number (1531490675).

Almost surely, 2^20521214550 is an apocalyptic number.

20521214550 is an abundant number, since it is smaller than the sum of its proper divisors (34612449750).

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

20521214550 is a wasteful number, since it uses less digits than its factorization.

20521214550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45602717 (or 45602709 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The spelling of 20521214550 in words is "twenty billion, five hundred twenty-one million, two hundred fourteen thousand, five hundred fifty".