21221021022 has 8 divisors (see below), whose sum is σ = 42442042056. Its totient is φ = 7073673672.

The previous prime is 21221021021. The next prime is 21221021113. The reversal of 21221021022 is 22012012212.

It is a sphenic number, since it is the product of 3 distinct primes.

21221021022 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21221020992 and 21221021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221021021) 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, 1768418413 + ... + 1768418424.

It is an arithmetic number, because the mean of its divisors is an integer number (5305255257).

Almost surely, 2^21221021022 is an apocalyptic number.

21221021022 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21221021022 is a wasteful number, since it uses less digits than its factorization.

21221021022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3536836842.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21221021022 its reverse (22012012212), we get a palindrome (43233033234).

The spelling of 21221021022 in words is "twenty-one billion, two hundred twenty-one million, twenty-one thousand, twenty-two".