21836950590 has 128 divisors (see below), whose sum is σ = 65875783680. Its totient is φ = 4509301248.

The previous prime is 21836950589. The next prime is 21836950621. The reversal of 21836950590 is 9505963812.

It is a happy number.

It is a super-2 number, since 2×21836950590² (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 63 ways as a sum of consecutive naturals, for example, 43216 + ... + 213404.

It is an arithmetic number, because the mean of its divisors is an integer number (514654560).

Almost surely, 2^21836950590 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21836950590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32937891840).

21836950590 is an abundant number, since it is smaller than the sum of its proper divisors (44038833090).

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

21836950590 is a wasteful number, since it uses less digits than its factorization.

21836950590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170266.

The product of its (nonzero) digits is 583200, while the sum is 48.

The spelling of 21836950590 in words is "twenty-one billion, eight hundred thirty-six million, nine hundred fifty thousand, five hundred ninety".