21969378160 has 40 divisors (see below), whose sum is σ = 51094627056. Its totient is φ = 8785029120.

The previous prime is 21969378139. The next prime is 21969378173. The reversal of 21969378160 is 6187396912.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21969378098 and 21969378107.

It is a congruent number.

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, 228027 + ... + 309733.

Almost surely, 2^21969378160 is an apocalyptic number.

21969378160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21969378160 is an abundant number, since it is smaller than the sum of its proper divisors (29125248896).

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

21969378160 is a wasteful number, since it uses less digits than its factorization.

21969378160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85081 (or 85075 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 52.

The spelling of 21969378160 in words is "twenty-one billion, nine hundred sixty-nine million, three hundred seventy-eight thousand, one hundred sixty".