21436774 has 4 divisors (see below), whose sum is σ = 32155164. Its totient is φ = 10718386.

The previous prime is 21436763. The next prime is 21436781. The reversal of 21436774 is 47763412.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5359192 + ... + 5359195.

It is an arithmetic number, because the mean of its divisors is an integer number (8038791).

Almost surely, 2^21436774 is an apocalyptic number.

21436774 is a deficient number, since it is larger than the sum of its proper divisors (10718390).

21436774 is a wasteful number, since it uses less digits than its factorization.

21436774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10718389.

The product of its digits is 28224, while the sum is 34.

The square root of 21436774 is about 4629.9863930686. The cubic root of 21436774 is about 277.7920481321.

The spelling of 21436774 in words is "twenty-one million, four hundred thirty-six thousand, seven hundred seventy-four".