21556293330 has 64 divisors (see below), whose sum is σ = 60779714688. Its totient is φ = 4823784960.

The previous prime is 21556293329. The next prime is 21556293349. The reversal of 21556293330 is 3339265512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2508099 + ... + 2516678.

It is an arithmetic number, because the mean of its divisors is an integer number (949683042).

Almost surely, 2^21556293330 is an apocalyptic number.

21556293330 is an abundant number, since it is smaller than the sum of its proper divisors (39223421358).

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

21556293330 is a wasteful number, since it uses less digits than its factorization.

21556293330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5024811.

The product of its (nonzero) digits is 145800, while the sum is 39.

The spelling of 21556293330 in words is "twenty-one billion, five hundred fifty-six million, two hundred ninety-three thousand, three hundred thirty".