21000012022 has 32 divisors (see below), whose sum is σ = 34636896000. Its totient is φ = 9469720800.

The previous prime is 21000011987. The next prime is 21000012071. The reversal of 21000012022 is 22021000012.

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, 3008997 + ... + 3015967.

It is an arithmetic number, because the mean of its divisors is an integer number (1082403000).

Almost surely, 2^21000012022 is an apocalyptic number.

21000012022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21000012022 is a deficient number, since it is larger than the sum of its proper divisors (13636883978).

21000012022 is a wasteful number, since it uses less digits than its factorization.

21000012022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8052.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21000012022 its reverse (22021000012), we get a palindrome (43021012034).

The spelling of 21000012022 in words is "twenty-one billion, twelve thousand, twenty-two".