15854027221 has 2 divisors, whose sum is σ = 15854027222. Its totient is φ = 15854027220.

The previous prime is 15854027191. The next prime is 15854027237. The reversal of 15854027221 is 12272045851.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12125092996 + 3728934225 = 110114^2 + 61065^2 .

It is a cyclic number.

It is not a de Polignac number, because 15854027221 - 2¹⁹ = 15853502933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15854027281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7927013610 + 7927013611.

It is an arithmetic number, because the mean of its divisors is an integer number (7927013611).

Almost surely, 2^15854027221 is an apocalyptic number.

It is an amenable number.

15854027221 is a deficient number, since it is larger than the sum of its proper divisors (1).

15854027221 is an equidigital number, since it uses as much as digits as its factorization.

15854027221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 44800, while the sum is 37.

It can be divided in two parts, 158540 and 27221, that added together give a square (185761 = 431²).

The spelling of 15854027221 in words is "fifteen billion, eight hundred fifty-four million, twenty-seven thousand, two hundred twenty-one".