21946504788 has 144 divisors (see below), whose sum is σ = 61222936320. Its totient is φ = 6587013888.

The previous prime is 21946504759. The next prime is 21946504831. The reversal of 21946504788 is 88740564912.

It is a happy number.

21946504788 is a `hidden beast` number, since 2 + 19 + 46 + 504 + 7 + 88 = 666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4437445 + ... + 4442387.

It is an arithmetic number, because the mean of its divisors is an integer number (425159280).

Almost surely, 2^21946504788 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21946504788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30611468160).

21946504788 is an abundant number, since it is smaller than the sum of its proper divisors (39276431532).

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

21946504788 is a wasteful number, since it uses less digits than its factorization.

21946504788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5198 (or 5193 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 54.

The spelling of 21946504788 in words is "twenty-one billion, nine hundred forty-six million, five hundred four thousand, seven hundred eighty-eight".