402404440220421 has 16 divisors (see below), whose sum is σ = 551315422336704. Its totient is φ = 260888782137984.

The previous prime is 402404440220381. The next prime is 402404440220429. The reversal of 402404440220421 is 124022044404204.

It is not a de Polignac number, because 402404440220421 - 2⁹ = 402404440219909 is a prime.

It is a super-2 number, since 2×402404440220421² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402404440220429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 904736536 + ... + 905181201.

It is an arithmetic number, because the mean of its divisors is an integer number (34457213896044).

Almost surely, 2^{402404440220421} is an apocalyptic number.

It is an amenable number.

402404440220421 is a deficient number, since it is larger than the sum of its proper divisors (148910982116283).

402404440220421 is a wasteful number, since it uses less digits than its factorization.

402404440220421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1809919780.

The product of its (nonzero) digits is 65536, while the sum is 33.

Adding to 402404440220421 its reverse (124022044404204), we get a palindrome (526426484624625).

The spelling of 402404440220421 in words is "four hundred two trillion, four hundred four billion, four hundred forty million, two hundred twenty thousand, four hundred twenty-one".