16002657426221 has 2 divisors, whose sum is σ = 16002657426222. Its totient is φ = 16002657426220.

The previous prime is 16002657426181. The next prime is 16002657426257. The reversal of 16002657426221 is 12262475620061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9336165804196 + 6666491622025 = 3055514^2 + 2581955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16002657426221 is a prime.

It is a super-2 number, since 2×16002657426221² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16002657426271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8001328713110 + 8001328713111.

It is an arithmetic number, because the mean of its divisors is an integer number (8001328713111).

Almost surely, 2^{16002657426221} is an apocalyptic number.

It is an amenable number.

16002657426221 is a deficient number, since it is larger than the sum of its proper divisors (1).

16002657426221 is an equidigital number, since it uses as much as digits as its factorization.

16002657426221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 16002657426221 in words is "sixteen trillion, two billion, six hundred fifty-seven million, four hundred twenty-six thousand, two hundred twenty-one".