21455414 has 4 divisors (see below), whose sum is σ = 32183124. Its totient is φ = 10727706.

The previous prime is 21455393. The next prime is 21455429. The reversal of 21455414 is 41455412.

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

It is a super-2 number, since 2×21455414² = 920669579822792, 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 as a sum of consecutive naturals, namely, 5363852 + ... + 5363855.

It is an arithmetic number, because the mean of its divisors is an integer number (8045781).

Almost surely, 2^21455414 is an apocalyptic number.

21455414 is a deficient number, since it is larger than the sum of its proper divisors (10727710).

21455414 is a wasteful number, since it uses less digits than its factorization.

21455414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10727709.

The product of its digits is 3200, while the sum is 26.

The square root of 21455414 is about 4631.9989205526. The cubic root of 21455414 is about 277.8725413330.

The spelling of 21455414 in words is "twenty-one million, four hundred fifty-five thousand, four hundred fourteen".