21230311331220 has 48 divisors (see below), whose sum is σ = 61362448240128. Its totient is φ = 5478790020480.

The previous prime is 21230311331209. The next prime is 21230311331239. The reversal of 21230311331220 is 2213311303212.

It is a super-2 number, since 2×21230311331220² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

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, 5707071079 + ... + 5707074798.

It is an arithmetic number, because the mean of its divisors is an integer number (1278384338336).

Almost surely, 2^{21230311331220} is an apocalyptic number.

21230311331220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21230311331220 is an abundant number, since it is smaller than the sum of its proper divisors (40132136908908).

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

21230311331220 is a wasteful number, since it uses less digits than its factorization.

21230311331220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11414145920 (or 11414145918 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 21230311331220 its reverse (2213311303212), we get a palindrome (23443622634432).

The spelling of 21230311331220 in words is "twenty-one trillion, two hundred thirty billion, three hundred eleven million, three hundred thirty-one thousand, two hundred twenty".