21373995 has 8 divisors (see below), whose sum is σ = 34198416. Its totient is φ = 11399456.

The previous prime is 21373991. The next prime is 21374011. The reversal of 21373995 is 59937312.

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

It is a cyclic number.

It is not a de Polignac number, because 21373995 - 2² = 21373991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21373991) 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, 712452 + ... + 712481.

It is an arithmetic number, because the mean of its divisors is an integer number (4274802).

Almost surely, 2^21373995 is an apocalyptic number.

21373995 is a deficient number, since it is larger than the sum of its proper divisors (12824421).

21373995 is a wasteful number, since it uses less digits than its factorization.

21373995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1424941.

The product of its digits is 51030, while the sum is 39.

The square root of 21373995 is about 4623.2018125970. The cubic root of 21373995 is about 277.5206055635.

The spelling of 21373995 in words is "twenty-one million, three hundred seventy-three thousand, nine hundred ninety-five".