20101211122220 has 24 divisors (see below), whose sum is σ = 44695634143104. Its totient is φ = 7567514775296.

The previous prime is 20101211122207. The next prime is 20101211122229. The reversal of 20101211122220 is 2222111210102.

It is a super-2 number, since 2×20101211122220² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (20101211122229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29560604252 + ... + 29560604931.

It is an arithmetic number, because the mean of its divisors is an integer number (1862318089296).

Almost surely, 2^{20101211122220} is an apocalyptic number.

20101211122220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20101211122220 is an abundant number, since it is smaller than the sum of its proper divisors (24594423020884).

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

20101211122220 is a wasteful number, since it uses less digits than its factorization.

20101211122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59121209209 (or 59121209207 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20101211122220 its reverse (2222111210102), we get a palindrome (22323322332322).

The spelling of 20101211122220 in words is "twenty trillion, one hundred one billion, two hundred eleven million, one hundred twenty-two thousand, two hundred twenty".