21941961 has 8 divisors (see below), whose sum is σ = 29450304. Its totient is φ = 14530800.

The previous prime is 21941921. The next prime is 21941981. The reversal of 21941961 is 16914912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21941961 - 2⁷ = 21941833 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21941921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23766 + ... + 24671.

It is an arithmetic number, because the mean of its divisors is an integer number (3681288).

Almost surely, 2^21941961 is an apocalyptic number.

It is an amenable number.

21941961 is a deficient number, since it is larger than the sum of its proper divisors (7508343).

21941961 is a wasteful number, since it uses less digits than its factorization.

21941961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48591.

The product of its digits is 3888, while the sum is 33.

The square root of 21941961 is about 4684.2246957207. The cubic root of 21941961 is about 279.9573106687.

The spelling of 21941961 in words is "twenty-one million, nine hundred forty-one thousand, nine hundred sixty-one".