21123222411340 has 72 divisors (see below), whose sum is σ = 51626032299072. Its totient is φ = 7238736449280.

The previous prime is 21123222411299. The next prime is 21123222411349. The reversal of 21123222411340 is 4311422232112.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 21123222411299 and 21123222411308.

It is not an unprimeable number, because it can be changed into a prime (21123222411349) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3202281 + ... + 7245760.

It is an arithmetic number, because the mean of its divisors is an integer number (717028226376).

Almost surely, 2^{21123222411340} is an apocalyptic number.

21123222411340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21123222411340 is an abundant number, since it is smaller than the sum of its proper divisors (30502809887732).

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

21123222411340 is a wasteful number, since it uses less digits than its factorization.

21123222411340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10450127 (or 10450118 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 21123222411340 its reverse (4311422232112), we get a palindrome (25434644643452).

The spelling of 21123222411340 in words is "twenty-one trillion, one hundred twenty-three billion, two hundred twenty-two million, four hundred eleven thousand, three hundred forty".