21211121010220 has 96 divisors (see below), whose sum is σ = 44985298821120. Its totient is φ = 8400706702080.

The previous prime is 21211121010197. The next prime is 21211121010221. The reversal of 21211121010220 is 2201012111212.

It is a junction number, because it is equal to n+sod(n) for n = 21211121010194 and 21211121010203.

It is not an unprimeable number, because it can be changed into a prime (21211121010221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1557458571 + ... + 1557472189.

It is an arithmetic number, because the mean of its divisors is an integer number (468596862720).

Almost surely, 2^{21211121010220} is an apocalyptic number.

21211121010220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211121010220 is an abundant number, since it is smaller than the sum of its proper divisors (23774177810900).

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

21211121010220 is a wasteful number, since it uses less digits than its factorization.

21211121010220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15583 (or 15581 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21211121010220 its reverse (2201012111212), we get a palindrome (23412133121432).

The spelling of 21211121010220 in words is "twenty-one trillion, two hundred eleven billion, one hundred twenty-one million, ten thousand, two hundred twenty".