21990945602 has 8 divisors (see below), whose sum is σ = 34050496512. Its totient is φ = 10640780100.

The previous prime is 21990945593. The next prime is 21990945703. The reversal of 21990945602 is 20654909912.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177346274 + ... + 177346397.

It is an arithmetic number, because the mean of its divisors is an integer number (4256312064).

Almost surely, 2^21990945602 is an apocalyptic number.

21990945602 is a deficient number, since it is larger than the sum of its proper divisors (12059550910).

21990945602 is a wasteful number, since it uses less digits than its factorization.

21990945602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354692704.

The product of its (nonzero) digits is 349920, while the sum is 47.

The spelling of 21990945602 in words is "twenty-one billion, nine hundred ninety million, nine hundred forty-five thousand, six hundred two".