3123221100021 has 24 divisors (see below), whose sum is σ = 4921501193856. Its totient is φ = 1892837471040.

The previous prime is 3123221099987. The next prime is 3123221100061. The reversal of 3123221100021 is 1200011223213.

3123221100021 is a `hidden beast` number, since 312 + 322 + 1 + 10 + 0 + 0 + 21 = 666.

It is not a de Polignac number, because 3123221100021 - 2¹⁹ = 3123220575733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3123221099967 and 3123221100003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3123221100061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10752921 + ... + 11039553.

It is an arithmetic number, because the mean of its divisors is an integer number (205062549744).

Almost surely, 2^{3123221100021} is an apocalyptic number.

It is an amenable number.

3123221100021 is a deficient number, since it is larger than the sum of its proper divisors (1798280093835).

3123221100021 is a wasteful number, since it uses less digits than its factorization.

3123221100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396713 (or 396710 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 3123221100021 its reverse (1200011223213), we get a palindrome (4323232323234).

The spelling of 3123221100021 in words is "three trillion, one hundred twenty-three billion, two hundred twenty-one million, one hundred thousand, twenty-one".