20212554100 has 72 divisors (see below), whose sum is σ = 45815692608. Its totient is φ = 7725484800.

The previous prime is 20212554097. The next prime is 20212554137. The reversal of 20212554100 is 145521202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2519095 + ... + 2527105.

It is an arithmetic number, because the mean of its divisors is an integer number (636329064).

Almost surely, 2^20212554100 is an apocalyptic number.

20212554100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20212554100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22907846304).

20212554100 is an abundant number, since it is smaller than the sum of its proper divisors (25603138508).

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

20212554100 is a wasteful number, since it uses less digits than its factorization.

20212554100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9145 (or 9138 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The spelling of 20212554100 in words is "twenty billion, two hundred twelve million, five hundred fifty-four thousand, one hundred".