21094220390 has 16 divisors (see below), whose sum is σ = 39278893680. Its totient is φ = 8146733280.

The previous prime is 21094220363. The next prime is 21094220443. The reversal of 21094220390 is 9302249012.

It is a super-2 number, since 2×21094220390² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36369056 + ... + 36369635.

It is an arithmetic number, because the mean of its divisors is an integer number (2454930855).

Almost surely, 2^21094220390 is an apocalyptic number.

21094220390 is a deficient number, since it is larger than the sum of its proper divisors (18184673290).

21094220390 is a wasteful number, since it uses less digits than its factorization.

21094220390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72738727.

The product of its (nonzero) digits is 7776, while the sum is 32.

The spelling of 21094220390 in words is "twenty-one billion, ninety-four million, two hundred twenty thousand, three hundred ninety".