21011021122220 has 12 divisors (see below), whose sum is σ = 44123144356704. Its totient is φ = 8404408448880.

The previous prime is 21011021122211. The next prime is 21011021122229. The reversal of 21011021122220 is 2222112011012.

It is an interprime number because it is at equal distance from previous prime (21011021122211) and next prime (21011021122229).

It is not an unprimeable number, because it can be changed into a prime (21011021122229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525275528036 + ... + 525275528075.

It is an arithmetic number, because the mean of its divisors is an integer number (3676928696392).

Almost surely, 2^{21011021122220} is an apocalyptic number.

21011021122220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011021122220 is an abundant number, since it is smaller than the sum of its proper divisors (23112123234484).

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

21011021122220 is a wasteful number, since it uses less digits than its factorization.

21011021122220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050551056120 (or 1050551056118 counting only the distinct ones).

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

Adding to 21011021122220 its reverse (2222112011012), we get a palindrome (23233133133232).

The spelling of 21011021122220 in words is "twenty-one trillion, eleven billion, twenty-one million, one hundred twenty-two thousand, two hundred twenty".