21699496 has 64 divisors (see below), whose sum is σ = 51367680. Its totient is φ = 8363520.

The previous prime is 21699481. The next prime is 21699499. The reversal of 21699496 is 69499612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21699499) 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, 29485 + ... + 30211.

It is an arithmetic number, because the mean of its divisors is an integer number (802620).

Almost surely, 2^21699496 is an apocalyptic number.

21699496 is a gapful number since it is divisible by the number (26) 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 21699496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25683840).

21699496 is an abundant number, since it is smaller than the sum of its proper divisors (29668184).

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

21699496 is a wasteful number, since it uses less digits than its factorization.

21699496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794 (or 790 counting only the distinct ones).

The product of its digits is 209952, while the sum is 46.

The square root of 21699496 is about 4658.2717825391. The cubic root of 21699496 is about 278.9222857937.

The spelling of 21699496 in words is "twenty-one million, six hundred ninety-nine thousand, four hundred ninety-six".