212110010021 has 32 divisors (see below), whose sum is σ = 277725305088. Its totient is φ = 157202519040.

The previous prime is 212110009999. The next prime is 212110010029. The reversal of 212110010021 is 120010011212.

It is not a de Polignac number, because 212110010021 - 2²² = 212105815717 is a prime.

It is a super-2 number, since 2×212110010021² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212110009984 and 212110010011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212110010029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1511 + ... + 651323.

It is an arithmetic number, because the mean of its divisors is an integer number (8678915784).

Almost surely, 2^212110010021 is an apocalyptic number.

It is an amenable number.

212110010021 is a deficient number, since it is larger than the sum of its proper divisors (65615295067).

212110010021 is a wasteful number, since it uses less digits than its factorization.

212110010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650061.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 212110010021 its reverse (120010011212), we get a palindrome (332120021233).

The spelling of 212110010021 in words is "two hundred twelve billion, one hundred ten million, ten thousand, twenty-one".