21416390 has 16 divisors (see below), whose sum is σ = 38646720. Its totient is φ = 8544960.

The previous prime is 21416389. The next prime is 21416411. The reversal of 21416390 is 9361412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1826 + ... + 6794.

It is an arithmetic number, because the mean of its divisors is an integer number (2415420).

Almost surely, 2^21416390 is an apocalyptic number.

21416390 is a deficient number, since it is larger than the sum of its proper divisors (17230330).

21416390 is a wasteful number, since it uses less digits than its factorization.

21416390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5407.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 21416390 is about 4627.7845671552. The cubic root of 21416390 is about 277.7039703758.

The spelling of 21416390 in words is "twenty-one million, four hundred sixteen thousand, three hundred ninety".