21961107 has 24 divisors (see below), whose sum is σ = 36391680. Its totient is φ = 12501360.

The previous prime is 21961099. The next prime is 21961109. The reversal of 21961107 is 70116912.

It is not a de Polignac number, because 21961107 - 2³ = 21961099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21961109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22132 + ... + 23102.

It is an arithmetic number, because the mean of its divisors is an integer number (1516320).

Almost surely, 2^21961107 is an apocalyptic number.

21961107 is a deficient number, since it is larger than the sum of its proper divisors (14430573).

21961107 is a wasteful number, since it uses less digits than its factorization.

21961107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343 (or 1340 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The square root of 21961107 is about 4686.2679180772. The cubic root of 21961107 is about 280.0387148848.

The spelling of 21961107 in words is "twenty-one million, nine hundred sixty-one thousand, one hundred seven".