21221010010022 has 4 divisors (see below), whose sum is σ = 31831515015036. Its totient is φ = 10610505005010.

The previous prime is 21221010010021. The next prime is 21221010010043. The reversal of 21221010010022 is 22001001012212.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21221010009979 and 21221010010006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221010010021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305252502504 + ... + 5305252502507.

It is an arithmetic number, because the mean of its divisors is an integer number (7957878753759).

Almost surely, 2^{21221010010022} is an apocalyptic number.

21221010010022 is a deficient number, since it is larger than the sum of its proper divisors (10610505005014).

21221010010022 is a wasteful number, since it uses less digits than its factorization.

21221010010022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10610505005013.

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

Adding to 21221010010022 its reverse (22001001012212), we get a palindrome (43222011022234).

The spelling of 21221010010022 in words is "twenty-one trillion, two hundred twenty-one billion, ten million, ten thousand, twenty-two".