402406513621 has 24 divisors (see below), whose sum is σ = 470124600000. Its totient is φ = 343435365504.

The previous prime is 402406513583. The next prime is 402406513651. The reversal of 402406513621 is 126315604204.

It is not a de Polignac number, because 402406513621 - 2⁷ = 402406513493 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 (402406513651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10715245 + ... + 10752733.

It is an arithmetic number, because the mean of its divisors is an integer number (19588525000).

Almost surely, 2^402406513621 is an apocalyptic number.

It is an amenable number.

402406513621 is a deficient number, since it is larger than the sum of its proper divisors (67718086379).

402406513621 is a wasteful number, since it uses less digits than its factorization.

402406513621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38441 (or 38434 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 402406513621 in words is "four hundred two billion, four hundred six million, five hundred thirteen thousand, six hundred twenty-one".