187221127146493 has 6 divisors (see below), whose sum is σ = 205788511657022. Its totient is φ = 170201024678520.

The previous prime is 187221127146481. The next prime is 187221127146511. The reversal of 187221127146493 is 394641721122781.

It can be written as a sum of positive squares in only one way, i.e., 185006188483204 + 2214938663289 = 13601698^2 + 1488267^2 .

It is not a de Polignac number, because 187221127146493 - 2¹³ = 187221127138301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187221127147493) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 773641021146 + ... + 773641021387.

Almost surely, 2^{187221127146493} is an apocalyptic number.

It is an amenable number.

187221127146493 is a deficient number, since it is larger than the sum of its proper divisors (18567384510529).

187221127146493 is a wasteful number, since it uses less digits than its factorization.

187221127146493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547282042555 (or 1547282042544 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 58.

The spelling of 187221127146493 in words is "one hundred eighty-seven trillion, two hundred twenty-one billion, one hundred twenty-seven million, one hundred forty-six thousand, four hundred ninety-three".