16421000 has 32 divisors (see below), whose sum is σ = 38427480. Its totient is φ = 6568000.

The previous prime is 16420961. The next prime is 16421023. The reversal of 16421000 is 12461.

It can be written as a sum of positive squares in 4 ways, for example, as 850084 + 15570916 = 922^2 + 3946^2 .

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, 7211 + ... + 9210.

Almost surely, 2^16421000 is an apocalyptic number.

16421000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16421000 is an abundant number, since it is smaller than the sum of its proper divisors (22006480).

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

16421000 is a wasteful number, since it uses less digits than its factorization.

16421000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16442 (or 16428 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 16421000 is about 4052.2833069765. The cubic root of 16421000 is about 254.1752154549.

Adding to 16421000 its reverse (12461), we get a palindrome (16433461).

It can be divided in two parts, 164 and 21000, that multiplied together give a triangular number (3444000 = T₂₆₂₄).

The spelling of 16421000 in words is "sixteen million, four hundred twenty-one thousand".