15221055501893 has 2 divisors, whose sum is σ = 15221055501894. Its totient is φ = 15221055501892.

The previous prime is 15221055501853. The next prime is 15221055501901. The reversal of 15221055501893 is 39810555012251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13877584419169 + 1343471082724 = 3725263^2 + 1159082^2 .

It is a cyclic number.

It is not a de Polignac number, because 15221055501893 - 2³⁸ = 14946177594949 is a prime.

It is a super-2 number, since 2×15221055501893² (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 (15221055501823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7610527750946 + 7610527750947.

It is an arithmetic number, because the mean of its divisors is an integer number (7610527750947).

Almost surely, 2^{15221055501893} is an apocalyptic number.

It is an amenable number.

15221055501893 is a deficient number, since it is larger than the sum of its proper divisors (1).

15221055501893 is an equidigital number, since it uses as much as digits as its factorization.

15221055501893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540000, while the sum is 47.

The spelling of 15221055501893 in words is "fifteen trillion, two hundred twenty-one billion, fifty-five million, five hundred one thousand, eight hundred ninety-three".