21097271141 has 2 divisors, whose sum is σ = 21097271142. Its totient is φ = 21097271140.

The previous prime is 21097271089. The next prime is 21097271257. The reversal of 21097271141 is 14117279012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11385957025 + 9711314116 = 106705^2 + 98546^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21097271141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21097271941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10548635570 + 10548635571.

It is an arithmetic number, because the mean of its divisors is an integer number (10548635571).

Almost surely, 2^21097271141 is an apocalyptic number.

It is an amenable number.

21097271141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21097271141 is an equidigital number, since it uses as much as digits as its factorization.

21097271141 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 35.

The spelling of 21097271141 in words is "twenty-one billion, ninety-seven million, two hundred seventy-one thousand, one hundred forty-one".