16900621 has 2 divisors, whose sum is σ = 16900622. Its totient is φ = 16900620.

The previous prime is 16900603. The next prime is 16900679. The reversal of 16900621 is 12600961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15721225 + 1179396 = 3965^2 + 1086^2 .

It is a cyclic number.

It is not a de Polignac number, because 16900621 - 2⁷ = 16900493 is a prime.

It is a super-3 number, since 3×16900621³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16900691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8450310 + 8450311.

It is an arithmetic number, because the mean of its divisors is an integer number (8450311).

Almost surely, 2^16900621 is an apocalyptic number.

It is an amenable number.

16900621 is a deficient number, since it is larger than the sum of its proper divisors (1).

16900621 is an equidigital number, since it uses as much as digits as its factorization.

16900621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 16900621 is about 4111.0364873107. The cubic root of 16900621 is about 256.6261376009.

The spelling of 16900621 in words is "sixteen million, nine hundred thousand, six hundred twenty-one".