21914493 has 8 divisors (see below), whose sum is σ = 29770848. Its totient is φ = 14333904.

The previous prime is 21914491. The next prime is 21914509. The reversal of 21914493 is 39441912.

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

It is not a de Polignac number, because 21914493 - 2¹ = 21914491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21914491) 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, 68755 + ... + 69072.

It is an arithmetic number, because the mean of its divisors is an integer number (3721356).

Almost surely, 2^21914493 is an apocalyptic number.

It is an amenable number.

21914493 is a deficient number, since it is larger than the sum of its proper divisors (7856355).

21914493 is a wasteful number, since it uses less digits than its factorization.

21914493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137883.

The product of its digits is 7776, while the sum is 33.

The square root of 21914493 is about 4681.2918088921. The cubic root of 21914493 is about 279.8404405541.

The spelling of 21914493 in words is "twenty-one million, nine hundred fourteen thousand, four hundred ninety-three".