21221774359440 has 40 divisors (see below), whose sum is σ = 65787500515008. Its totient is φ = 5659139829120.

The previous prime is 21221774359421. The next prime is 21221774359531. The reversal of 21221774359440 is 4495347712212.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×21221774359440² (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 7 ways as a sum of consecutive naturals, for example, 44212029676 + ... + 44212030155.

Almost surely, 2^{21221774359440} is an apocalyptic number.

21221774359440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221774359440 is an abundant number, since it is smaller than the sum of its proper divisors (44565726155568).

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

21221774359440 is a wasteful number, since it uses less digits than its factorization.

21221774359440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88424059847 (or 88424059841 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 51.

The spelling of 21221774359440 in words is "twenty-one trillion, two hundred twenty-one billion, seven hundred seventy-four million, three hundred fifty-nine thousand, four hundred forty".