21211113534220 has 12 divisors (see below), whose sum is σ = 44543338421904. Its totient is φ = 8484445413680.

The previous prime is 21211113534211. The next prime is 21211113534251. The reversal of 21211113534220 is 2243531111212.

It is a super-2 number, since 2×21211113534220² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530277838336 + ... + 530277838375.

It is an arithmetic number, because the mean of its divisors is an integer number (3711944868492).

Almost surely, 2^{21211113534220} is an apocalyptic number.

21211113534220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211113534220 is an abundant number, since it is smaller than the sum of its proper divisors (23332224887684).

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

21211113534220 is a wasteful number, since it uses less digits than its factorization.

21211113534220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060555676720 (or 1060555676718 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

Adding to 21211113534220 its reverse (2243531111212), we get a palindrome (23454644645432).

The spelling of 21211113534220 in words is "twenty-one trillion, two hundred eleven billion, one hundred thirteen million, five hundred thirty-four thousand, two hundred twenty".