21697676 has 48 divisors (see below), whose sum is σ = 50991360. Its totient is φ = 7801920.

The previous prime is 21697667. The next prime is 21697681. The reversal of 21697676 is 67679612.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1295 + ... + 6713.

It is an arithmetic number, because the mean of its divisors is an integer number (1062320).

Almost surely, 2^21697676 is an apocalyptic number.

21697676 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 21697676, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25495680).

21697676 is an abundant number, since it is smaller than the sum of its proper divisors (29293684).

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

21697676 is a wasteful number, since it uses less digits than its factorization.

21697676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5454 (or 5452 counting only the distinct ones).

The product of its digits is 190512, while the sum is 44.

The square root of 21697676 is about 4658.0764270244. The cubic root of 21697676 is about 278.9144875672.

The spelling of 21697676 in words is "twenty-one million, six hundred ninety-seven thousand, six hundred seventy-six".