21371959 has 8 divisors (see below), whose sum is σ = 24472448. Its totient is φ = 18283320.

The previous prime is 21371929. The next prime is 21371963. The reversal of 21371959 is 95917312.

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 21371959 - 2¹¹ = 21369911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21371929) 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, 1324 + ... + 6670.

It is an arithmetic number, because the mean of its divisors is an integer number (3059056).

Almost surely, 2^21371959 is an apocalyptic number.

21371959 is a deficient number, since it is larger than the sum of its proper divisors (3100489).

21371959 is an equidigital number, since it uses as much as digits as its factorization.

21371959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5925.

The product of its digits is 17010, while the sum is 37.

The square root of 21371959 is about 4622.9816136342. The cubic root of 21371959 is about 277.5117934549.

It can be divided in two parts, 2137 and 1959, that added together give a 12-th power (4096 = 2¹²).

The spelling of 21371959 in words is "twenty-one million, three hundred seventy-one thousand, nine hundred fifty-nine".