212021012100 has 72 divisors (see below), whose sum is σ = 619075515520. Its totient is φ = 56020222080.

The previous prime is 212021012089. The next prime is 212021012153. The reversal of 212021012100 is 1210120212.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 3209212 + ... + 3274611.

Almost surely, 2^212021012100 is an apocalyptic number.

212021012100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212021012100 is an abundant number, since it is smaller than the sum of its proper divisors (407054503420).

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

212021012100 is a wasteful number, since it uses less digits than its factorization.

212021012100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6483949 (or 6483942 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 212021012100 its reverse (1210120212), we get a palindrome (213231132312).

The spelling of 212021012100 in words is "two hundred twelve billion, twenty-one million, twelve thousand, one hundred".