21097272011 has 2 divisors, whose sum is σ = 21097272012. Its totient is φ = 21097272010.

The previous prime is 21097271941. The next prime is 21097272037. The reversal of 21097272011 is 11027279012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21097272011 - 2¹⁸ = 21097009867 is a prime.

It is a super-2 number, since 2×21097272011² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21097272211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10548636005 + 10548636006.

It is an arithmetic number, because the mean of its divisors is an integer number (10548636006).

Almost surely, 2^21097272011 is an apocalyptic number.

21097272011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21097272011 is an equidigital number, since it uses as much as digits as its factorization.

21097272011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 32.

The spelling of 21097272011 in words is "twenty-one billion, ninety-seven million, two hundred seventy-two thousand, eleven".