21650186488 has 64 divisors (see below), whose sum is σ = 48451944960. Its totient is φ = 8867607936.

The previous prime is 21650186483. The next prime is 21650186513. The reversal of 21650186488 is 88468105612.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21650186483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1638195 + ... + 1651357.

It is an arithmetic number, because the mean of its divisors is an integer number (757061640).

Almost surely, 2^21650186488 is an apocalyptic number.

21650186488 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21650186488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24225972480).

21650186488 is an abundant number, since it is smaller than the sum of its proper divisors (26801758472).

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

21650186488 is a wasteful number, since it uses less digits than its factorization.

21650186488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14476 (or 14472 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 49.

The spelling of 21650186488 in words is "twenty-one billion, six hundred fifty million, one hundred eighty-six thousand, four hundred eighty-eight".