16302772021 has 2 divisors, whose sum is σ = 16302772022. Its totient is φ = 16302772020.

The previous prime is 16302771959. The next prime is 16302772091. The reversal of 16302772021 is 12027720361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10549549521 + 5753222500 = 102711^2 + 75850^2 .

It is a cyclic number.

It is not a de Polignac number, because 16302772021 - 2²¹ = 16300674869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16302772091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8151386010 + 8151386011.

It is an arithmetic number, because the mean of its divisors is an integer number (8151386011).

Almost surely, 2^16302772021 is an apocalyptic number.

It is an amenable number.

16302772021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16302772021 is an equidigital number, since it uses as much as digits as its factorization.

16302772021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 31.

The spelling of 16302772021 in words is "sixteen billion, three hundred two million, seven hundred seventy-two thousand, twenty-one".