21087475778702 has 4 divisors (see below), whose sum is σ = 31631213668056. Its totient is φ = 10543737889350.

The previous prime is 21087475778653. The next prime is 21087475778723. The reversal of 21087475778702 is 20787757478012.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5271868944674 + ... + 5271868944677.

It is an arithmetic number, because the mean of its divisors is an integer number (7907803417014).

Almost surely, 2^{21087475778702} is an apocalyptic number.

21087475778702 is a deficient number, since it is larger than the sum of its proper divisors (10543737889354).

21087475778702 is a wasteful number, since it uses less digits than its factorization.

21087475778702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10543737889353.

The product of its (nonzero) digits is 86051840, while the sum is 65.

The spelling of 21087475778702 in words is "twenty-one trillion, eighty-seven billion, four hundred seventy-five million, seven hundred seventy-eight thousand, seven hundred two".