402424422021 has 20 divisors (see below), whose sum is σ = 601207222572. Its totient is φ = 268258540608.

The previous prime is 402424421953. The next prime is 402424422073. The reversal of 402424422021 is 120224424204.

It can be written as a sum of positive squares in 2 ways, for example, as 170495493921 + 231928928100 = 412911^2 + 481590^2 .

It is not a de Polignac number, because 402424422021 - 2¹⁰ = 402424420997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402424426021) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 692755 + ... + 1133471.

Almost surely, 2^402424422021 is an apocalyptic number.

It is an amenable number.

402424422021 is a deficient number, since it is larger than the sum of its proper divisors (198782800551).

402424422021 is a wasteful number, since it uses less digits than its factorization.

402424422021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452002 (or 451993 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 27.

Adding to 402424422021 its reverse (120224424204), we get a palindrome (522648846225).

The spelling of 402424422021 in words is "four hundred two billion, four hundred twenty-four million, four hundred twenty-two thousand, twenty-one".