21941976 has 64 divisors (see below), whose sum is σ = 63233280. Its totient is φ = 6215040.

The previous prime is 21941921. The next prime is 21941981. The reversal of 21941976 is 67914912.

It is a congruent number.

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, 21510 + ... + 22506.

It is an arithmetic number, because the mean of its divisors is an integer number (988020).

Almost surely, 2^21941976 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21941976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31616640).

21941976 is an abundant number, since it is smaller than the sum of its proper divisors (41291304).

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

21941976 is a wasteful number, since it uses less digits than its factorization.

21941976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144 (or 1140 counting only the distinct ones).

The product of its digits is 27216, while the sum is 39.

The square root of 21941976 is about 4684.2262968392. The cubic root of 21941976 is about 279.9573744637.

It can be divided in two parts, 219 and 41976, that added together give a triangular number (42195 = T₂₉₀).

The spelling of 21941976 in words is "twenty-one million, nine hundred forty-one thousand, nine hundred seventy-six".