21022123020 has 48 divisors (see below), whose sum is σ = 58918126848. Its totient is φ = 5600548800.

The previous prime is 21022122959. The next prime is 21022123037. The reversal of 21022123020 is 2032122012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103624 + ... + 229743.

It is an arithmetic number, because the mean of its divisors is an integer number (1227460976).

Almost surely, 2^21022123020 is an apocalyptic number.

21022123020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022123020 is an abundant number, since it is smaller than the sum of its proper divisors (37896003828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21022123020 is a wasteful number, since it uses less digits than its factorization.

21022123020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334430 (or 334428 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21022123020 its reverse (2032122012), we get a palindrome (23054245032).

The spelling of 21022123020 in words is "twenty-one billion, twenty-two million, one hundred twenty-three thousand, twenty".