21770847884 has 24 divisors (see below), whose sum is σ = 39013109520. Its totient is φ = 10624610304.

The previous prime is 21770847859. The next prime is 21770847893. The reversal of 21770847884 is 48874807712.

It is a happy number.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

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, 197432 + ... + 287264.

It is an arithmetic number, because the mean of its divisors is an integer number (1625546230).

Almost surely, 2^21770847884 is an apocalyptic number.

It is an amenable number.

21770847884 is a deficient number, since it is larger than the sum of its proper divisors (17242261636).

21770847884 is a wasteful number, since it uses less digits than its factorization.

21770847884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91289 (or 91287 counting only the distinct ones).

The product of its (nonzero) digits is 5619712, while the sum is 56.

The spelling of 21770847884 in words is "twenty-one billion, seven hundred seventy million, eight hundred forty-seven thousand, eight hundred eighty-four".