21222011243220 has 96 divisors (see below), whose sum is σ = 59689136908800. Its totient is φ = 5633732941824.

The previous prime is 21222011243201. The next prime is 21222011243239. The reversal of 21222011243220 is 2234211022212.

It is an interprime number because it is at equal distance from previous prime (21222011243201) and next prime (21222011243239).

It is a super-2 number, since 2×21222011243220² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 106069036 + ... + 106268924.

It is an arithmetic number, because the mean of its divisors is an integer number (621761842800).

Almost surely, 2^{21222011243220} is an apocalyptic number.

21222011243220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222011243220 is an abundant number, since it is smaller than the sum of its proper divisors (38467125665580).

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

21222011243220 is a wasteful number, since it uses less digits than its factorization.

21222011243220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207857 (or 207855 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21222011243220 its reverse (2234211022212), we get a palindrome (23456222265432).

The spelling of 21222011243220 in words is "twenty-one trillion, two hundred twenty-two billion, eleven million, two hundred forty-three thousand, two hundred twenty".