21020122012220 has 48 divisors (see below), whose sum is σ = 44204163127488. Its totient is φ = 8396258304000.

The previous prime is 21020122012207. The next prime is 21020122012231. The reversal of 21020122012220 is 2221022102012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 393778172 + ... + 393831548.

It is an arithmetic number, because the mean of its divisors is an integer number (920920065156).

Almost surely, 2^{21020122012220} is an apocalyptic number.

21020122012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020122012220 is an abundant number, since it is smaller than the sum of its proper divisors (23184041115268).

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

21020122012220 is a wasteful number, since it uses less digits than its factorization.

21020122012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80630 (or 80628 counting only the distinct ones).

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

Adding to 21020122012220 its reverse (2221022102012), we get a palindrome (23241144114232).

The spelling of 21020122012220 in words is "twenty-one trillion, twenty billion, one hundred twenty-two million, twelve thousand, two hundred twenty".