21261374 has 8 divisors (see below), whose sum is σ = 32493960. Its totient is φ = 10430056.

The previous prime is 21261337. The next prime is 21261377. The reversal of 21261374 is 47316212.

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

It is a super-3 number, since 3×21261374³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21261377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100184 + ... + 100395.

It is an arithmetic number, because the mean of its divisors is an integer number (4061745).

Almost surely, 2^21261374 is an apocalyptic number.

21261374 is a deficient number, since it is larger than the sum of its proper divisors (11232586).

21261374 is a wasteful number, since it uses less digits than its factorization.

21261374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200634.

The product of its digits is 2016, while the sum is 26.

The square root of 21261374 is about 4611.0057471229. The cubic root of 21261374 is about 277.0323221199.

Adding to 21261374 its reverse (47316212), we get a palindrome (68577586).

The spelling of 21261374 in words is "twenty-one million, two hundred sixty-one thousand, three hundred seventy-four".