21122101100220 has 24 divisors (see below), whose sum is σ = 59141883080784. Its totient is φ = 5632560293376.

The previous prime is 21122101100197. The next prime is 21122101100231. The reversal of 21122101100220 is 2200110122112.

It is a super-2 number, since 2×21122101100220² (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 self number, because there is not a number n which added to its sum of digits gives 21122101100220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176017509109 + ... + 176017509228.

It is an arithmetic number, because the mean of its divisors is an integer number (2464245128366).

Almost surely, 2^{21122101100220} is an apocalyptic number.

21122101100220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122101100220 is an abundant number, since it is smaller than the sum of its proper divisors (38019781980564).

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

21122101100220 is a wasteful number, since it uses less digits than its factorization.

21122101100220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352035018349 (or 352035018347 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21122101100220 its reverse (2200110122112), we get a palindrome (23322211222332).

The spelling of 21122101100220 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred one million, one hundred thousand, two hundred twenty".