21022101982 has 64 divisors (see below), whose sum is σ = 38967091200. Its totient is φ = 8307699840.

The previous prime is 21022101973. The next prime is 21022101983. The reversal of 21022101982 is 28910122012.

It is a self number, because there is not a number n which added to its sum of digits gives 21022101982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022101983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2681244 + ... + 2689072.

It is an arithmetic number, because the mean of its divisors is an integer number (608860800).

Almost surely, 2^21022101982 is an apocalyptic number.

21022101982 is a deficient number, since it is larger than the sum of its proper divisors (17944989218).

21022101982 is a wasteful number, since it uses less digits than its factorization.

21022101982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8161.

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

Adding to 21022101982 its reverse (28910122012), we get a palindrome (49932223994).

The spelling of 21022101982 in words is "twenty-one billion, twenty-two million, one hundred one thousand, nine hundred eighty-two".