402120000021204 has 36 divisors (see below), whose sum is σ = 1016472328746420. Its totient is φ = 134039692926720.

The previous prime is 402120000021191. The next prime is 402120000021221.

402120000021204 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 376063160953104 + 26056839068100 = 19392348^2 + 5104590^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3418614 + ... + 28564434.

Almost surely, 2^{402120000021204} is an apocalyptic number.

It is an amenable number.

402120000021204 is an abundant number, since it is smaller than the sum of its proper divisors (614352328725216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

402120000021204 is a wasteful number, since it uses less digits than its factorization.

402120000021204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25590040 (or 25590035 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

It can be divided in two parts, 4021200000 and 21204, that added together give a palindrome (4021221204).

The spelling of 402120000021204 in words is "four hundred two trillion, one hundred twenty billion, twenty-one thousand, two hundred four".