21690160380 has 72 divisors (see below), whose sum is σ = 75192560352. Its totient is φ = 4957750656.

The previous prime is 21690160367. The next prime is 21690160403. The reversal of 21690160380 is 8306109612.

21690160380 is a `hidden beast` number, since 216 + 9 + 0 + 1 + 60 + 380 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8605947 + ... + 8608466.

It is an arithmetic number, because the mean of its divisors is an integer number (1044341116).

Almost surely, 2^21690160380 is an apocalyptic number.

21690160380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21690160380 is an abundant number, since it is smaller than the sum of its proper divisors (53502399972).

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

21690160380 is a wasteful number, since it uses less digits than its factorization.

21690160380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17214435 (or 17214430 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

Adding to 21690160380 its reverse (8306109612), we get a palindrome (29996269992).

The spelling of 21690160380 in words is "twenty-one billion, six hundred ninety million, one hundred sixty thousand, three hundred eighty".