398022020021 has 4 divisors (see below), whose sum is σ = 407278346112. Its totient is φ = 388765693932.

The previous prime is 398022020009. The next prime is 398022020069. The reversal of 398022020021 is 120020220893.

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 398022020021 - 2²² = 398017825717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398022020321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4628162981 + ... + 4628163066.

It is an arithmetic number, because the mean of its divisors is an integer number (101819586528).

Almost surely, 2^398022020021 is an apocalyptic number.

It is an amenable number.

398022020021 is a deficient number, since it is larger than the sum of its proper divisors (9256326091).

398022020021 is an equidigital number, since it uses as much as digits as its factorization.

398022020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9256326090.

The product of its (nonzero) digits is 3456, while the sum is 29.

The spelling of 398022020021 in words is "three hundred ninety-eight billion, twenty-two million, twenty thousand, twenty-one".