21221933091344 has 40 divisors (see below), whose sum is σ = 41334082574400. Its totient is φ = 10555098795648.

The previous prime is 21221933091343. The next prime is 21221933091371. The reversal of 21221933091344 is 44319033912212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21221933091295 and 21221933091304.

It is not an unprimeable number, because it can be changed into a prime (21221933091343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12434207 + ... + 14037569.

It is an arithmetic number, because the mean of its divisors is an integer number (1033352064360).

Almost surely, 2^{21221933091344} is an apocalyptic number.

It is an amenable number.

21221933091344 is a deficient number, since it is larger than the sum of its proper divisors (20112149483056).

21221933091344 is a wasteful number, since it uses less digits than its factorization.

21221933091344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607727 (or 1607721 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 44.

The spelling of 21221933091344 in words is "twenty-one trillion, two hundred twenty-one billion, nine hundred thirty-three million, ninety-one thousand, three hundred forty-four".