21221010982 has 8 divisors (see below), whose sum is σ = 31933869552. Its totient is φ = 10576387800.

The previous prime is 21221010977. The next prime is 21221010997. The reversal of 21221010982 is 28901012212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21221010982.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17058069 + ... + 17059312.

It is an arithmetic number, because the mean of its divisors is an integer number (3991733694).

Almost surely, 2^21221010982 is an apocalyptic number.

21221010982 is a deficient number, since it is larger than the sum of its proper divisors (10712858570).

21221010982 is a wasteful number, since it uses less digits than its factorization.

21221010982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34117694.

The product of its (nonzero) digits is 1152, while the sum is 28.

The spelling of 21221010982 in words is "twenty-one billion, two hundred twenty-one million, ten thousand, nine hundred eighty-two".