402213022421 has 6 divisors (see below), whose sum is σ = 467880454710. Its totient is φ = 344754019176.

The previous prime is 402213022391. The next prime is 402213022429. The reversal of 402213022421 is 124220312204.

It can be written as a sum of positive squares in only one way, i.e., 244738973521 + 157474048900 = 494711^2 + 396830^2 .

It is not a de Polignac number, because 402213022421 - 2²⁶ = 402145913557 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 (402213022429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4104214466 + ... + 4104214563.

It is an arithmetic number, because the mean of its divisors is an integer number (77980075785).

Almost surely, 2^402213022421 is an apocalyptic number.

It is an amenable number.

402213022421 is a deficient number, since it is larger than the sum of its proper divisors (65667432289).

402213022421 is an equidigital number, since it uses as much as digits as its factorization.

402213022421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8208429043 (or 8208429036 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 402213022421 its reverse (124220312204), we get a palindrome (526433334625).

The spelling of 402213022421 in words is "four hundred two billion, two hundred thirteen million, twenty-two thousand, four hundred twenty-one".