21715483402 has 4 divisors (see below), whose sum is σ = 32573225106. Its totient is φ = 10857741700.

The previous prime is 21715483399. The next prime is 21715483421. The reversal of 21715483402 is 20438451712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21176361441 + 539121961 = 145521^2 + 23219^2 .

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 as a sum of consecutive naturals, namely, 5428870849 + ... + 5428870852.

Almost surely, 2^21715483402 is an apocalyptic number.

21715483402 is a deficient number, since it is larger than the sum of its proper divisors (10857741704).

21715483402 is a wasteful number, since it uses less digits than its factorization.

21715483402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10857741703.

The product of its (nonzero) digits is 53760, while the sum is 37.

The spelling of 21715483402 in words is "twenty-one billion, seven hundred fifteen million, four hundred eighty-three thousand, four hundred two".