21945219160 has 16 divisors (see below), whose sum is σ = 49376743200. Its totient is φ = 8778087648.

The previous prime is 21945219137. The next prime is 21945219161. The reversal of 21945219160 is 6191254912.

It is a super-2 number, since 2×21945219160² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 548630479 = 21945219160 / (2 + 1 + 9 + 4 + 5 + 2 + 1 + 9 + 1 + 6 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21945219161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274315200 + ... + 274315279.

It is an arithmetic number, because the mean of its divisors is an integer number (3086046450).

Almost surely, 2^21945219160 is an apocalyptic number.

21945219160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21945219160 is an abundant number, since it is smaller than the sum of its proper divisors (27431524040).

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

21945219160 is a wasteful number, since it uses less digits than its factorization.

21945219160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548630490 (or 548630486 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 21945219160 in words is "twenty-one billion, nine hundred forty-five million, two hundred nineteen thousand, one hundred sixty".