100031212111021 has 4 divisors (see below), whose sum is σ = 100295146708000. Its totient is φ = 99767277514044.

The previous prime is 100031212110967. The next prime is 100031212111057. The reversal of 100031212111021 is 120111212130001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 100031212111021 - 2¹¹ = 100031212108973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100031212110986 and 100031212111004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100031212111081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131967297921 + ... + 131967298678.

It is an arithmetic number, because the mean of its divisors is an integer number (25073786677000).

Almost surely, 2^{100031212111021} is an apocalyptic number.

It is an amenable number.

100031212111021 is a deficient number, since it is larger than the sum of its proper divisors (263934596979).

100031212111021 is an equidigital number, since it uses as much as digits as its factorization.

100031212111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263934596978.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 100031212111021 its reverse (120111212130001), we get a palindrome (220142424241022).

The spelling of 100031212111021 in words is "one hundred trillion, thirty-one billion, two hundred twelve million, one hundred eleven thousand, twenty-one".