21254674 has 8 divisors (see below), whose sum is σ = 36436608. Its totient is φ = 9109140.

The previous prime is 21254647. The next prime is 21254677. The reversal of 21254674 is 47645212.

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

It is a super-2 number, since 2×21254674² = 903522333692552, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21254677) 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, 759082 + ... + 759109.

It is an arithmetic number, because the mean of its divisors is an integer number (4554576).

Almost surely, 2^21254674 is an apocalyptic number.

21254674 is a deficient number, since it is larger than the sum of its proper divisors (15181934).

21254674 is a wasteful number, since it uses less digits than its factorization.

21254674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1518200.

The product of its digits is 13440, while the sum is 31.

The square root of 21254674 is about 4610.2791672522. The cubic root of 21254674 is about 277.0032190844.

Adding to 21254674 its reverse (47645212), we get a palindrome (68899886).

The spelling of 21254674 in words is "twenty-one million, two hundred fifty-four thousand, six hundred seventy-four".