21770847885 has 16 divisors (see below), whose sum is σ = 34846075584. Its totient is φ = 11606879232.

The previous prime is 21770847859. The next prime is 21770847893. The reversal of 21770847885 is 58874807712.

It is not a de Polignac number, because 21770847885 - 2⁶ = 21770847821 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222307 + ... + 304896.

It is an arithmetic number, because the mean of its divisors is an integer number (2177879724).

Almost surely, 2^21770847885 is an apocalyptic number.

It is an amenable number.

21770847885 is a deficient number, since it is larger than the sum of its proper divisors (13075227699).

21770847885 is a wasteful number, since it uses less digits than its factorization.

21770847885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529964.

The product of its (nonzero) digits is 7024640, while the sum is 57.

The spelling of 21770847885 in words is "twenty-one billion, seven hundred seventy million, eight hundred forty-seven thousand, eight hundred eighty-five".