21947353050 has 48 divisors (see below), whose sum is σ = 62205072192. Its totient is φ = 5016537600.

The previous prime is 21947353007. The next prime is 21947353117. The reversal of 21947353050 is 5035374912.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10450071 + ... + 10452170.

It is an arithmetic number, because the mean of its divisors is an integer number (1295939004).

Almost surely, 2^21947353050 is an apocalyptic number.

21947353050 is an abundant number, since it is smaller than the sum of its proper divisors (40257719142).

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

21947353050 is a wasteful number, since it uses less digits than its factorization.

21947353050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20902263 (or 20902258 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 39.

The spelling of 21947353050 in words is "twenty-one billion, nine hundred forty-seven million, three hundred fifty-three thousand, fifty".