21941370 has 96 divisors (see below), whose sum is σ = 64022400. Its totient is φ = 5166720.

The previous prime is 21941351. The next prime is 21941389. The reversal of 21941370 is 7314912.

It is an interprime number because it is at equal distance from previous prime (21941351) and next prime (21941389).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 36331 + ... + 36929.

It is an arithmetic number, because the mean of its divisors is an integer number (666900).

Almost surely, 2^21941370 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21941370, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32011200).

21941370 is an abundant number, since it is smaller than the sum of its proper divisors (42081030).

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

21941370 is a wasteful number, since it uses less digits than its factorization.

21941370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660 (or 657 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 21941370 is about 4684.1616112171. The cubic root of 21941370 is about 279.9547971247.

The spelling of 21941370 in words is "twenty-one million, nine hundred forty-one thousand, three hundred seventy".