22001021221220 has 36 divisors (see below), whose sum is σ = 47850259151604. Its totient is φ = 8496946120320.

The previous prime is 22001021221169. The next prime is 22001021221229. The reversal of 22001021221220 is 2212212010022.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 5146340644 + 21995874880576 = 71738^2 + 4689976^2 .

It is not an unprimeable number, because it can be changed into a prime (22001021221229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 653996891 + ... + 654030530.

Almost surely, 2^{22001021221220} is an apocalyptic number.

22001021221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22001021221220 is an abundant number, since it is smaller than the sum of its proper divisors (25849237930384).

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

22001021221220 is a wasteful number, since it uses less digits than its factorization.

22001021221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308027488 (or 1308027457 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22001021221220 its reverse (2212212010022), we get a palindrome (24213233231242).

The spelling of 22001021221220 in words is "twenty-two trillion, one billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty".