21746918490 has 32 divisors (see below), whose sum is σ = 56937387456. Its totient is φ = 5271980160.

The previous prime is 21746918467. The next prime is 21746918507. The reversal of 21746918490 is 9481964712.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32949547 + ... + 32950206.

It is an arithmetic number, because the mean of its divisors is an integer number (1779293358).

Almost surely, 2^21746918490 is an apocalyptic number.

21746918490 is an abundant number, since it is smaller than the sum of its proper divisors (35190468966).

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

21746918490 is a wasteful number, since it uses less digits than its factorization.

21746918490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65899774.

The product of its (nonzero) digits is 870912, while the sum is 51.

The spelling of 21746918490 in words is "twenty-one billion, seven hundred forty-six million, nine hundred eighteen thousand, four hundred ninety".