21787877002 has 16 divisors (see below), whose sum is σ = 34520631552. Its totient is φ = 10297344960.

The previous prime is 21787876963. The next prime is 21787877021. The reversal of 21787877002 is 20077878712.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4083583 + ... + 4088914.

It is an arithmetic number, because the mean of its divisors is an integer number (2157539472).

Almost surely, 2^21787877002 is an apocalyptic number.

21787877002 is a deficient number, since it is larger than the sum of its proper divisors (12732754550).

21787877002 is a wasteful number, since it uses less digits than its factorization.

21787877002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8172573.

The product of its (nonzero) digits is 614656, while the sum is 49.

The spelling of 21787877002 in words is "twenty-one billion, seven hundred eighty-seven million, eight hundred seventy-seven thousand, two".