402120421012 has 6 divisors (see below), whose sum is σ = 703710736778. Its totient is φ = 201060210504.

The previous prime is 402120421009. The next prime is 402120421037. The reversal of 402120421012 is 210124021204.

It can be written as a sum of positive squares in only one way, i.e., 384047920656 + 18072500356 = 619716^2 + 134434^2 .

It is a super-2 number, since 2×402120421012² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50265052623 + ... + 50265052630.

Almost surely, 2^402120421012 is an apocalyptic number.

It is an amenable number.

402120421012 is a deficient number, since it is larger than the sum of its proper divisors (301590315766).

402120421012 is a wasteful number, since it uses less digits than its factorization.

402120421012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100530105257 (or 100530105255 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 402120421012 its reverse (210124021204), we get a palindrome (612244442216).

The spelling of 402120421012 in words is "four hundred two billion, one hundred twenty million, four hundred twenty-one thousand, twelve".