16626141421 has 2 divisors, whose sum is σ = 16626141422. Its totient is φ = 16626141420.

The previous prime is 16626141391. The next prime is 16626141439. The reversal of 16626141421 is 12414162661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8370420100 + 8255721321 = 91490^2 + 90861^2 .

It is a cyclic number.

It is not a de Polignac number, because 16626141421 - 2¹⁹ = 16625617133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16623141421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8313070710 + 8313070711.

It is an arithmetic number, because the mean of its divisors is an integer number (8313070711).

Almost surely, 2^16626141421 is an apocalyptic number.

It is an amenable number.

16626141421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16626141421 is an equidigital number, since it uses as much as digits as its factorization.

16626141421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 34.

The spelling of 16626141421 in words is "sixteen billion, six hundred twenty-six million, one hundred forty-one thousand, four hundred twenty-one".