21436718 has 8 divisors (see below), whose sum is σ = 32516640. Its totient is φ = 10597840.

The previous prime is 21436697. The next prime is 21436721. The reversal of 21436718 is 81763412.

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

It is a super-2 number, since 2×21436718² = 919065757223048, which contains 22 as substring.

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, 60038 + ... + 60393.

It is an arithmetic number, because the mean of its divisors is an integer number (4064580).

Almost surely, 2^21436718 is an apocalyptic number.

21436718 is a deficient number, since it is larger than the sum of its proper divisors (11079922).

21436718 is a wasteful number, since it uses less digits than its factorization.

21436718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120522.

The product of its digits is 8064, while the sum is 32.

The square root of 21436718 is about 4629.9803455306. The cubic root of 21436718 is about 277.7918062367.

The spelling of 21436718 in words is "twenty-one million, four hundred thirty-six thousand, seven hundred eighteen".