402122421 has 32 divisors (see below), whose sum is σ = 617149440. Its totient is φ = 258508800.

The previous prime is 402122419. The next prime is 402122533. The reversal of 402122421 is 124221204.

It is not a de Polignac number, because 402122421 - 2¹ = 402122419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 402122394 and 402122403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402122221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 294781 + ... + 296141.

It is an arithmetic number, because the mean of its divisors is an integer number (19285920).

Almost surely, 2^402122421 is an apocalyptic number.

It is an amenable number.

402122421 is a deficient number, since it is larger than the sum of its proper divisors (215027019).

402122421 is a wasteful number, since it uses less digits than its factorization.

402122421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1754 (or 1748 counting only the distinct ones).

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

The square root of 402122421 is about 20052.9903256347. The cubic root of 402122421 is about 738.1071792251.

Adding to 402122421 its reverse (124221204), we get a palindrome (526343625).

The spelling of 402122421 in words is "four hundred two million, one hundred twenty-two thousand, four hundred twenty-one".