21000023022122 has 8 divisors (see below), whose sum is σ = 32094374807556. Its totient is φ = 10301898086272.

The previous prime is 21000023022101. The next prime is 21000023022127. The reversal of 21000023022122 is 22122032000012.

It can be written as a sum of positive squares in 2 ways, for example, as 16416994100521 + 4583028921601 = 4051789^2 + 2140801^2 .

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 21000023022122.

It is not an unprimeable number, because it can be changed into a prime (21000023022127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99056712263 + ... + 99056712474.

Almost surely, 2^{21000023022122} is an apocalyptic number.

21000023022122 is a deficient number, since it is larger than the sum of its proper divisors (11094351785434).

21000023022122 is a wasteful number, since it uses less digits than its factorization.

21000023022122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198113424792.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21000023022122 its reverse (22122032000012), we get a palindrome (43122055022134).

The spelling of 21000023022122 in words is "twenty-one trillion, twenty-three million, twenty-two thousand, one hundred twenty-two".