21010102021220 has 48 divisors (see below), whose sum is σ = 48526114549248. Its totient is φ = 7592521315200.

The previous prime is 21010102021211. The next prime is 21010102021231. The reversal of 21010102021220 is 2212020101012.

It is a junction number, because it is equal to n+sod(n) for n = 21010102021195 and 21010102021204.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 859648256 + ... + 859672695.

It is an arithmetic number, because the mean of its divisors is an integer number (1010960719776).

Almost surely, 2^{21010102021220} is an apocalyptic number.

21010102021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010102021220 is an abundant number, since it is smaller than the sum of its proper divisors (27516012528028).

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

21010102021220 is a wasteful number, since it uses less digits than its factorization.

21010102021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719321020 (or 1719321018 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21010102021220 its reverse (2212020101012), we get a palindrome (23222122122232).

The spelling of 21010102021220 in words is "twenty-one trillion, ten billion, one hundred two million, twenty-one thousand, two hundred twenty".