212864421 has 16 divisors (see below), whose sum is σ = 353852928. Its totient is φ = 110578800.

The previous prime is 212864417. The next prime is 212864447. The reversal of 212864421 is 124468212.

It is not a de Polignac number, because 212864421 - 2² = 212864417 is a prime.

It is a super-2 number, since 2×212864421² = 90622523455330482, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212864411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 460515 + ... + 460976.

It is an arithmetic number, because the mean of its divisors is an integer number (22115808).

Almost surely, 2^212864421 is an apocalyptic number.

212864421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212864421 is a deficient number, since it is larger than the sum of its proper divisors (140988507).

212864421 is a wasteful number, since it uses less digits than its factorization.

212864421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921512.

The product of its digits is 6144, while the sum is 30.

The square root of 212864421 is about 14589.8739199487. The cubic root of 212864421 is about 597.0825229840.

The spelling of 212864421 in words is "two hundred twelve million, eight hundred sixty-four thousand, four hundred twenty-one".