402121513 has 8 divisors (see below), whose sum is σ = 413773640. Its totient is φ = 390510720.

The previous prime is 402121487. The next prime is 402121523. The reversal of 402121513 is 315121204.

It can be written as a sum of positive squares in 4 ways, for example, as 50296464 + 351825049 = 7092^2 + 18757^2 .

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 402121513 - 2⁹ = 402121001 is a prime.

It is a super-2 number, since 2×402121513² = 323403422434818338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402121523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9973 + ... + 30061.

It is an arithmetic number, because the mean of its divisors is an integer number (51721705).

Almost surely, 2^402121513 is an apocalyptic number.

It is an amenable number.

402121513 is a deficient number, since it is larger than the sum of its proper divisors (11652127).

402121513 is a wasteful number, since it uses less digits than its factorization.

402121513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20667.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 402121513 is about 20052.9676856070. The cubic root of 402121513 is about 738.1066236714.

Adding to 402121513 its reverse (315121204), we get a palindrome (717242717).

The spelling of 402121513 in words is "four hundred two million, one hundred twenty-one thousand, five hundred thirteen".