21746864748 has 24 divisors (see below), whose sum is σ = 57991639552. Its totient is φ = 6213389904.

The previous prime is 21746864747. The next prime is 21746864813. The reversal of 21746864748 is 84746864712.

It is a super-2 number, since 2×21746864748² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21746864747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129445540 + ... + 129445707.

Almost surely, 2^21746864748 is an apocalyptic number.

21746864748 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21746864748 is an abundant number, since it is smaller than the sum of its proper divisors (36244774804).

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

21746864748 is a wasteful number, since it uses less digits than its factorization.

21746864748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258891261 (or 258891259 counting only the distinct ones).

The product of its digits is 14450688, while the sum is 57.

The spelling of 21746864748 in words is "twenty-one billion, seven hundred forty-six million, eight hundred sixty-four thousand, seven hundred forty-eight".