212894915021 has 16 divisors (see below), whose sum is σ = 219909758976. Its totient is φ = 205991671536.

The previous prime is 212894914987. The next prime is 212894915099. The reversal of 212894915021 is 120519498212.

It is a cyclic number.

It is not a de Polignac number, because 212894915021 - 2⁶ = 212894914957 is a prime.

It is a super-2 number, since 2×212894915021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212894975021) 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, 2405660 + ... + 2492586.

It is an arithmetic number, because the mean of its divisors is an integer number (13744359936).

Almost surely, 2^212894915021 is an apocalyptic number.

It is an amenable number.

212894915021 is a deficient number, since it is larger than the sum of its proper divisors (7014843955).

212894915021 is a wasteful number, since it uses less digits than its factorization.

212894915021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87568.

The product of its (nonzero) digits is 103680, while the sum is 44.

The spelling of 212894915021 in words is "two hundred twelve billion, eight hundred ninety-four million, nine hundred fifteen thousand, twenty-one".