21421274 has 8 divisors (see below), whose sum is σ = 36722208. Its totient is φ = 9180540.

The previous prime is 21421273. The next prime is 21421319. The reversal of 21421274 is 47212412.

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

It is not an unprimeable number, because it can be changed into a prime (21421273) 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, 765032 + ... + 765059.

It is an arithmetic number, because the mean of its divisors is an integer number (4590276).

Almost surely, 2^21421274 is an apocalyptic number.

21421274 is a deficient number, since it is larger than the sum of its proper divisors (15300934).

21421274 is a wasteful number, since it uses less digits than its factorization.

21421274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1530100.

The product of its digits is 896, while the sum is 23.

The square root of 21421274 is about 4628.3122193733. The cubic root of 21421274 is about 277.7250788680.

Adding to 21421274 its reverse (47212412), we get a palindrome (68633686).

The spelling of 21421274 in words is "twenty-one million, four hundred twenty-one thousand, two hundred seventy-four".