16477123021 has 2 divisors, whose sum is σ = 16477123022. Its totient is φ = 16477123020.

The previous prime is 16477122997. The next prime is 16477123037. The reversal of 16477123021 is 12032177461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16438060521 + 39062500 = 128211^2 + 6250^2 .

It is a cyclic number.

It is not a de Polignac number, because 16477123021 - 2¹¹ = 16477120973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16477123051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8238561510 + 8238561511.

It is an arithmetic number, because the mean of its divisors is an integer number (8238561511).

Almost surely, 2^16477123021 is an apocalyptic number.

It is an amenable number.

16477123021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16477123021 is an equidigital number, since it uses as much as digits as its factorization.

16477123021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 34.

The spelling of 16477123021 in words is "sixteen billion, four hundred seventy-seven million, one hundred twenty-three thousand, twenty-one".