212021055690 has 32 divisors (see below), whose sum is σ = 508862817216. Its totient is φ = 56537583360.

The previous prime is 212021055667. The next prime is 212021055691. The reversal of 212021055690 is 96550120212.

It is a super-2 number, since 2×212021055690² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212021055691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2075410 + ... + 2175170.

It is an arithmetic number, because the mean of its divisors is an integer number (15901963038).

Almost surely, 2^212021055690 is an apocalyptic number.

212021055690 is an abundant number, since it is smaller than the sum of its proper divisors (296841761526).

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

212021055690 is a wasteful number, since it uses less digits than its factorization.

212021055690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170614.

The product of its (nonzero) digits is 10800, while the sum is 33.

The spelling of 212021055690 in words is "two hundred twelve billion, twenty-one million, fifty-five thousand, six hundred ninety".