21917962 has 8 divisors (see below), whose sum is σ = 35865792. Its totient is φ = 9962700.

The previous prime is 21917927. The next prime is 21917977. The reversal of 21917962 is 26971912.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498114 + ... + 498157.

It is an arithmetic number, because the mean of its divisors is an integer number (4483224).

Almost surely, 2^21917962 is an apocalyptic number.

21917962 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21917962 is a deficient number, since it is larger than the sum of its proper divisors (13947830).

21917962 is a wasteful number, since it uses less digits than its factorization.

21917962 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996284.

The product of its digits is 13608, while the sum is 37.

The square root of 21917962 is about 4681.6623116154. The cubic root of 21917962 is about 279.8552057488.

It can be divided in two parts, 2191 and 7962, that added together give a triangular number (10153 = T₁₄₂).

The spelling of 21917962 in words is "twenty-one million, nine hundred seventeen thousand, nine hundred sixty-two".