389121212220021 has 24 divisors (see below), whose sum is σ = 566225817612000. Its totient is φ = 257494069681632.

The previous prime is 389121212219977. The next prime is 389121212220023. The reversal of 389121212220021 is 120022212121983.

389121212220021 is a `hidden beast` number, since 3 + 89 + 121 + 212 + 220 + 0 + 21 = 666.

It is not a de Polignac number, because 389121212220021 - 2¹⁷ = 389121212088949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389121212220023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26484231 + ... + 38466308.

It is an arithmetic number, because the mean of its divisors is an integer number (23592742400500).

Almost surely, 2^{389121212220021} is an apocalyptic number.

It is an amenable number.

389121212220021 is a deficient number, since it is larger than the sum of its proper divisors (177104605391979).

389121212220021 is a wasteful number, since it uses less digits than its factorization.

389121212220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64955473 (or 64955470 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The spelling of 389121212220021 in words is "three hundred eighty-nine trillion, one hundred twenty-one billion, two hundred twelve million, two hundred twenty thousand, twenty-one".