21355414 has 4 divisors (see below), whose sum is σ = 32033124. Its totient is φ = 10677706.

The previous prime is 21355409. The next prime is 21355447. The reversal of 21355414 is 41455312.

It is a happy number.

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

It is a super-2 number, since 2×21355414² = 912107414222792, 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, 5338852 + ... + 5338855.

It is an arithmetic number, because the mean of its divisors is an integer number (8008281).

Almost surely, 2^21355414 is an apocalyptic number.

21355414 is a deficient number, since it is larger than the sum of its proper divisors (10677710).

21355414 is a wasteful number, since it uses less digits than its factorization.

21355414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10677709.

The product of its digits is 2400, while the sum is 25.

The square root of 21355414 is about 4621.1918376107. The cubic root of 21355414 is about 277.4401634912.

The spelling of 21355414 in words is "twenty-one million, three hundred fifty-five thousand, four hundred fourteen".