402404212111421 has 8 divisors (see below), whose sum is σ = 433364297275224. Its totient is φ = 371444971947840.

The previous prime is 402404212111399. The next prime is 402404212111459. The reversal of 402404212111421 is 124111212404204.

It can be written as a sum of positive squares in 4 ways, for example, as 45282280682521 + 357121931428900 = 6729211^2 + 18897670^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 402404212111421 - 2¹⁴ = 402404212095037 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 (402404212110421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210260810 + ... + 212166011.

It is an arithmetic number, because the mean of its divisors is an integer number (54170537159403).

Almost surely, 2^{402404212111421} is an apocalyptic number.

It is an amenable number.

402404212111421 is a deficient number, since it is larger than the sum of its proper divisors (30960085163803).

402404212111421 is a wasteful number, since it uses less digits than its factorization.

402404212111421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422500111.

The product of its (nonzero) digits is 4096, while the sum is 29.

Adding to 402404212111421 its reverse (124111212404204), we get a palindrome (526515424515625).

The spelling of 402404212111421 in words is "four hundred two trillion, four hundred four billion, two hundred twelve million, one hundred eleven thousand, four hundred twenty-one".