212100031 has 16 divisors (see below), whose sum is σ = 249627168. Its totient is φ = 177667200.

The previous prime is 212100023. The next prime is 212100067. The reversal of 212100031 is 130001212.

It is a cyclic number.

It is not a de Polignac number, because 212100031 - 2³ = 212100023 is a prime.

It is a super-2 number, since 2×212100031² = 89972846300401922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212099990 and 212100017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212100071) 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, 113041 + ... + 114901.

It is an arithmetic number, because the mean of its divisors is an integer number (15601698).

Almost surely, 2^212100031 is an apocalyptic number.

212100031 is a deficient number, since it is larger than the sum of its proper divisors (37527137).

212100031 is a wasteful number, since it uses less digits than its factorization.

212100031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2682.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 212100031 is about 14563.6544520941. The cubic root of 212100031 is about 596.3669637387.

Adding to 212100031 its reverse (130001212), we get a palindrome (342101243).

The spelling of 212100031 in words is "two hundred twelve million, one hundred thousand, thirty-one".