21154374271 has 2 divisors, whose sum is σ = 21154374272. Its totient is φ = 21154374270.

The previous prime is 21154374259. The next prime is 21154374287. The reversal of 21154374271 is 17247345112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21154374271 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21154374271.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21154374971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10577187135 + 10577187136.

It is an arithmetic number, because the mean of its divisors is an integer number (10577187136).

Almost surely, 2^21154374271 is an apocalyptic number.

21154374271 is a deficient number, since it is larger than the sum of its proper divisors (1).

21154374271 is an equidigital number, since it uses as much as digits as its factorization.

21154374271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47040, while the sum is 37.

The spelling of 21154374271 in words is "twenty-one billion, one hundred fifty-four million, three hundred seventy-four thousand, two hundred seventy-one".