21012212102220 has 96 divisors (see below), whose sum is σ = 67480079063040. Its totient is φ = 5422506344640.

The previous prime is 21012212102213. The next prime is 21012212102239. The reversal of 21012212102220 is 2220121221012.

It is a happy number.

21012212102220 is a `hidden beast` number, since 2 + 10 + 1 + 221 + 210 + 2 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21012212102193 and 21012212102202.

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, 627588162 + ... + 627621641.

It is an arithmetic number, because the mean of its divisors is an integer number (702917490240).

Almost surely, 2^{21012212102220} is an apocalyptic number.

21012212102220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012212102220 is an abundant number, since it is smaller than the sum of its proper divisors (46467866960820).

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

21012212102220 is a wasteful number, since it uses less digits than its factorization.

21012212102220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255209852 (or 1255209844 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21012212102220 its reverse (2220121221012), we get a palindrome (23232333323232).

The spelling of 21012212102220 in words is "twenty-one trillion, twelve billion, two hundred twelve million, one hundred two thousand, two hundred twenty".