8215129402 has 8 divisors (see below), whose sum is σ = 13047558516. Its totient is φ = 3865943232.

The previous prime is 8215129361. The next prime is 8215129469. The reversal of 8215129402 is 2049215128.

It can be written as a sum of positive squares in 2 ways, for example, as 8199121401 + 16008001 = 90549^2 + 4001^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (34), and also a Moran number because the ratio is a prime number: 241621453 = 8215129402 / (8 + 2 + 1 + 5 + 1 + 2 + 9 + 4 + 0 + 2).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 120810693 + ... + 120810760.

Almost surely, 2^8215129402 is an apocalyptic number.

8215129402 is a deficient number, since it is larger than the sum of its proper divisors (4832429114).

8215129402 is a wasteful number, since it uses less digits than its factorization.

8215129402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241621472.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 8215129402 is about 90637.3510314594. The cubic root of 8215129402 is about 2017.7691119598.

The spelling of 8215129402 in words is "eight billion, two hundred fifteen million, one hundred twenty-nine thousand, four hundred two".