3121011110021 has 4 divisors (see below), whose sum is σ = 3566869840032. Its totient is φ = 2675152380012.

The previous prime is 3121011109939. The next prime is 3121011110023. The reversal of 3121011110021 is 1200111101213.

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 not a de Polignac number, because 3121011110021 - 2¹⁰ = 3121011108997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3121011109978 and 3121011110005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121011110023) 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, 222929364995 + ... + 222929365008.

It is an arithmetic number, because the mean of its divisors is an integer number (891717460008).

Almost surely, 2^{3121011110021} is an apocalyptic number.

It is an amenable number.

3121011110021 is a deficient number, since it is larger than the sum of its proper divisors (445858730011).

3121011110021 is an equidigital number, since it uses as much as digits as its factorization.

3121011110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445858730010.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 3121011110021 its reverse (1200111101213), we get a palindrome (4321122211234).

The spelling of 3121011110021 in words is "three trillion, one hundred twenty-one billion, eleven million, one hundred ten thousand, twenty-one".