21447477790 has 8 divisors (see below), whose sum is σ = 38605460040. Its totient is φ = 8578991112.

The previous prime is 21447477773. The next prime is 21447477791. The reversal of 21447477790 is 9777474412.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21447477791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1072373880 + ... + 1072373899.

It is an arithmetic number, because the mean of its divisors is an integer number (4825682505).

Almost surely, 2^21447477790 is an apocalyptic number.

21447477790 is a deficient number, since it is larger than the sum of its proper divisors (17157982250).

21447477790 is a wasteful number, since it uses less digits than its factorization.

21447477790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2144747786.

The product of its (nonzero) digits is 2765952, while the sum is 52.

The spelling of 21447477790 in words is "twenty-one billion, four hundred forty-seven million, four hundred seventy-seven thousand, seven hundred ninety".