400120021004 has 48 divisors (see below), whose sum is σ = 775483099776. Its totient is φ = 179108160000.

The previous prime is 400120020967. The next prime is 400120021013.

400120021004 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 400120021004.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11777987 + ... + 11811909.

It is an arithmetic number, because the mean of its divisors is an integer number (16155897912).

Almost surely, 2^400120021004 is an apocalyptic number.

400120021004 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

400120021004 is a deficient number, since it is larger than the sum of its proper divisors (375363078772).

400120021004 is a wasteful number, since it uses less digits than its factorization.

400120021004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38006 (or 38004 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

It can be divided in two parts, 4001200 and 21004, that added together give a palindrome (4022204).

The spelling of 400120021004 in words is "four hundred billion, one hundred twenty million, twenty-one thousand, four".