21906303486 has 8 divisors (see below), whose sum is σ = 43812606984. Its totient is φ = 7302101160.

The previous prime is 21906303457. The next prime is 21906303569. The reversal of 21906303486 is 68430360912.

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

21906303486 is an admirable number.

It is a super-2 number, since 2×21906303486² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 1825525285 + ... + 1825525296.

It is an arithmetic number, because the mean of its divisors is an integer number (5476575873).

Almost surely, 2^21906303486 is an apocalyptic number.

21906303486 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21906303486 is a wasteful number, since it uses less digits than its factorization.

21906303486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3651050586.

The product of its (nonzero) digits is 186624, while the sum is 42.

The spelling of 21906303486 in words is "twenty-one billion, nine hundred six million, three hundred three thousand, four hundred eighty-six".