21221201022 has 32 divisors (see below), whose sum is σ = 50614543872. Its totient is φ = 5799582624.

The previous prime is 21221201021. The next prime is 21221201047. The reversal of 21221201022 is 22010212212.

It is a super-2 number, since 2×21221201022² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21221200992 and 21221201010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221201021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10983093 + ... + 10985024.

It is an arithmetic number, because the mean of its divisors is an integer number (1581704496).

Almost surely, 2^21221201022 is an apocalyptic number.

21221201022 is an abundant number, since it is smaller than the sum of its proper divisors (29393342850).

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

21221201022 is a wasteful number, since it uses less digits than its factorization.

21221201022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21968152.

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

Adding to 21221201022 its reverse (22010212212), we get a palindrome (43231413234).

The spelling of 21221201022 in words is "twenty-one billion, two hundred twenty-one million, two hundred one thousand, twenty-two".