16421090 has 16 divisors (see below), whose sum is σ = 33780672. Its totient is φ = 5630064.

The previous prime is 16421089. The next prime is 16421107. The reversal of 16421090 is 9012461.

It is a happy number.

16421090 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

16421090 is strictly pandigital in base 8.

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, 117224 + ... + 117363.

It is an arithmetic number, because the mean of its divisors is an integer number (2111292).

Almost surely, 2^16421090 is an apocalyptic number.

16421090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16421090 is an abundant number, since it is smaller than the sum of its proper divisors (17359582).

16421090 is a wasteful number, since it uses less digits than its factorization.

16421090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234601.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 16421090 is about 4052.2944118117. The cubic root of 16421090 is about 254.1756798142.

The spelling of 16421090 in words is "sixteen million, four hundred twenty-one thousand, ninety".