212000021100 has 216 divisors, whose sum is σ = 779957211488. Its totient is φ = 47147443200.

The previous prime is 212000021089. The next prime is 212000021111. The reversal of 212000021100 is 1120000212.

It is an interprime number because it is at equal distance from previous prime (212000021089) and next prime (212000021111).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 221641 + ... + 687840.

Almost surely, 2^212000021100 is an apocalyptic number.

212000021100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212000021100 is an abundant number, since it is smaller than the sum of its proper divisors (567957190388).

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

212000021100 is a wasteful number, since it uses less digits than its factorization.

212000021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909545 (or 909535 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 212000021100 its reverse (1120000212), we get a palindrome (213120021312).

The spelling of 212000021100 in words is "two hundred twelve billion, twenty-one thousand, one hundred".