21889293 has 8 divisors (see below), whose sum is σ = 29308800. Its totient is φ = 14531328.

The previous prime is 21889289. The next prime is 21889297. The reversal of 21889293 is 39298812.

It is an interprime number because it is at equal distance from previous prime (21889289) and next prime (21889297).

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

It is not a de Polignac number, because 21889293 - 2² = 21889289 is a prime.

It is a super-2 number, since 2×21889293² = 958282296079698, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21889297) 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, 14548 + ... + 15981.

It is an arithmetic number, because the mean of its divisors is an integer number (3663600).

Almost surely, 2^21889293 is an apocalyptic number.

It is an amenable number.

21889293 is a deficient number, since it is larger than the sum of its proper divisors (7419507).

21889293 is a wasteful number, since it uses less digits than its factorization.

21889293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30771.

The product of its digits is 62208, while the sum is 42.

The square root of 21889293 is about 4678.5994699269. The cubic root of 21889293 is about 279.7331343388.

The spelling of 21889293 in words is "twenty-one million, eight hundred eighty-nine thousand, two hundred ninety-three".