16421700 has 144 divisors (see below), whose sum is σ = 51941120. Its totient is φ = 3991680.

The previous prime is 16421693. The next prime is 16421707. The reversal of 16421700 is 712461.

16421700 = T₂₆₄ + T₂₆₅ + ... + T₄₈₈.

16421700 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (16421693) and next prime (16421707).

It is not an unprimeable number, because it can be changed into a prime (16421707) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 245067 + ... + 245133.

Almost surely, 2^16421700 is an apocalyptic number.

16421700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16421700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25970560).

16421700 is an abundant number, since it is smaller than the sum of its proper divisors (35519420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16421700 is a wasteful number, since it uses less digits than its factorization.

16421700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 16421700 is about 4052.3696771149. The cubic root of 16421700 is about 254.1788270929.

The spelling of 16421700 in words is "sixteen million, four hundred twenty-one thousand, seven hundred".