21964299280 has 160 divisors (see below), whose sum is σ = 64712786688. Its totient is φ = 6733670400.

The previous prime is 21964299271. The next prime is 21964299293. The reversal of 21964299280 is 8299246912.

It is a super-2 number, since 2×21964299280² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 346534 + ... + 404986.

Almost surely, 2^21964299280 is an apocalyptic number.

21964299280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21964299280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32356393344).

21964299280 is an abundant number, since it is smaller than the sum of its proper divisors (42748487408).

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

21964299280 is a wasteful number, since it uses less digits than its factorization.

21964299280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58545 (or 58539 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 52.

It can be divided in two parts, 2196 and 4299280, that added together give a square (4301476 = 2074²).

The spelling of 21964299280 in words is "twenty-one billion, nine hundred sixty-four million, two hundred ninety-nine thousand, two hundred eighty".