21001012021022 has 16 divisors (see below), whose sum is σ = 34365362745600. Its totient is φ = 9545895014040.

The previous prime is 21001012021013. The next prime is 21001012021061. The reversal of 21001012021022 is 22012021010012.

It is a super-2 number, since 2×21001012021022² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21001012020988 and 21001012021006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20876729 + ... + 21859547.

It is an arithmetic number, because the mean of its divisors is an integer number (2147835171600).

Almost surely, 2^{21001012021022} is an apocalyptic number.

21001012021022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21001012021022 is a deficient number, since it is larger than the sum of its proper divisors (13364350724578).

21001012021022 is a wasteful number, since it uses less digits than its factorization.

21001012021022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1954111.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21001012021022 its reverse (22012021010012), we get a palindrome (43013033031034).

The spelling of 21001012021022 in words is "twenty-one trillion, one billion, twelve million, twenty-one thousand, twenty-two".