22001022121020 has 96 divisors (see below), whose sum is σ = 62252484926016. Its totient is φ = 5805380505600.

The previous prime is 22001022120911. The next prime is 22001022121051. The reversal of 22001022121020 is 2012122010022.

It is a super-2 number, since 2×22001022121020² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2575351 + ... + 7115790.

It is an arithmetic number, because the mean of its divisors is an integer number (648463384646).

Almost surely, 2^{22001022121020} is an apocalyptic number.

22001022121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22001022121020 is an abundant number, since it is smaller than the sum of its proper divisors (40251462804996).

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

22001022121020 is a wasteful number, since it uses less digits than its factorization.

22001022121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9691551 (or 9691549 counting only the distinct ones).

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

Adding to 22001022121020 its reverse (2012122010022), we get a palindrome (24013144131042).

The spelling of 22001022121020 in words is "twenty-two trillion, one billion, twenty-two million, one hundred twenty-one thousand, twenty".