21961106 has 8 divisors (see below), whose sum is σ = 33312060. Its totient is φ = 10857088.

The previous prime is 21961099. The next prime is 21961109. The reversal of 21961106 is 60116912.

It can be written as a sum of positive squares in 2 ways, for example, as 21949225 + 11881 = 4685^2 + 109^2 .

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

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61511 + ... + 61866.

Almost surely, 2^21961106 is an apocalyptic number.

21961106 is a deficient number, since it is larger than the sum of its proper divisors (11350954).

21961106 is a wasteful number, since it uses less digits than its factorization.

21961106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123468.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 21961106 is about 4686.2678113825. The cubic root of 21961106 is about 280.0387106343.

The spelling of 21961106 in words is "twenty-one million, nine hundred sixty-one thousand, one hundred six".