21001474 has 8 divisors (see below), whose sum is σ = 33925500. Its totient is φ = 9692976.

The previous prime is 21001469. The next prime is 21001493. The reversal of 21001474 is 47410012.

It can be written as a sum of positive squares in 2 ways, for example, as 20766249 + 235225 = 4557^2 + 485^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 403849 + ... + 403900.

Almost surely, 2^21001474 is an apocalyptic number.

21001474 is a deficient number, since it is larger than the sum of its proper divisors (12924026).

21001474 is a wasteful number, since it uses less digits than its factorization.

21001474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807764.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 21001474 is about 4582.7365187189. The cubic root of 21001474 is about 275.8988724938.

Adding to 21001474 its reverse (47410012), we get a palindrome (68411486).

The spelling of 21001474 in words is "twenty-one million, one thousand, four hundred seventy-four".