21400174 has 8 divisors (see below), whose sum is σ = 32196528. Its totient is φ = 10668000.

The previous prime is 21400163. The next prime is 21400201. The reversal of 21400174 is 47100412.

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

It is a congruent number.

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, 15202 + ... + 16549.

It is an arithmetic number, because the mean of its divisors is an integer number (4024566).

Almost surely, 2^21400174 is an apocalyptic number.

21400174 is a deficient number, since it is larger than the sum of its proper divisors (10796354).

21400174 is a wasteful number, since it uses less digits than its factorization.

21400174 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32090.

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

The square root of 21400174 is about 4626.0322091399. The cubic root of 21400174 is about 277.6338623161.

Adding to 21400174 its reverse (47100412), we get a palindrome (68500586).

The spelling of 21400174 in words is "twenty-one million, four hundred thousand, one hundred seventy-four".