100031212021 has 16 divisors (see below), whose sum is σ = 111273433600. Its totient is φ = 89299661760.

The previous prime is 100031212003. The next prime is 100031212033. The reversal of 100031212021 is 120212130001.

It is a cyclic number.

It is not a de Polignac number, because 100031212021 - 2¹⁵ = 100031179253 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 100031211992 and 100031212010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100031212091) 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, 544126 + ... + 704368.

It is an arithmetic number, because the mean of its divisors is an integer number (6954589600).

Almost surely, 2^100031212021 is an apocalyptic number.

It is an amenable number.

100031212021 is a deficient number, since it is larger than the sum of its proper divisors (11242221579).

100031212021 is a wasteful number, since it uses less digits than its factorization.

100031212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161836.

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

Adding to 100031212021 its reverse (120212130001), we get a palindrome (220243342022).

The spelling of 100031212021 in words is "one hundred billion, thirty-one million, two hundred twelve thousand, twenty-one".