212021100031 has 8 divisors (see below), whose sum is σ = 238257825120. Its totient is φ = 187202576352.

The previous prime is 212021099929. The next prime is 212021100059. The reversal of 212021100031 is 130001120212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212021100031 - 2⁷ = 212021099903 is a prime.

It is a super-2 number, since 2×212021100031² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212021099984 and 212021100020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021100131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 354550036 + ... + 354550633.

It is an arithmetic number, because the mean of its divisors is an integer number (29782228140).

Almost surely, 2^212021100031 is an apocalyptic number.

212021100031 is a deficient number, since it is larger than the sum of its proper divisors (26236725089).

212021100031 is a wasteful number, since it uses less digits than its factorization.

212021100031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709100705.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 212021100031 its reverse (130001120212), we get a palindrome (342022220243).

The spelling of 212021100031 in words is "two hundred twelve billion, twenty-one million, one hundred thousand, thirty-one".