21355466447730 has 96 divisors (see below), whose sum is σ = 55257974035776. Its totient is φ = 5279806135296.

The previous prime is 21355466447641. The next prime is 21355466447753. The reversal of 21355466447730 is 3774466455312.

It is a happy 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, 17800789 + ... + 18962568.

It is an arithmetic number, because the mean of its divisors is an integer number (575603896206).

Almost surely, 2^{21355466447730} is an apocalyptic number.

21355466447730 is an abundant number, since it is smaller than the sum of its proper divisors (33902507588046).

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

21355466447730 is a wasteful number, since it uses less digits than its factorization.

21355466447730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36763468 (or 36763451 counting only the distinct ones).

The product of its (nonzero) digits is 50803200, while the sum is 57.

The spelling of 21355466447730 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred sixty-six million, four hundred forty-seven thousand, seven hundred thirty".