21480360091 has 2 divisors, whose sum is σ = 21480360092. Its totient is φ = 21480360090.

The previous prime is 21480360043. The next prime is 21480360107. The reversal of 21480360091 is 19006308412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21480360091 - 2¹¹ = 21480358043 is a prime.

It is a super-2 number, since 2×21480360091² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21480364091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10740180045 + 10740180046.

It is an arithmetic number, because the mean of its divisors is an integer number (10740180046).

Almost surely, 2^21480360091 is an apocalyptic number.

21480360091 is a deficient number, since it is larger than the sum of its proper divisors (1).

21480360091 is an equidigital number, since it uses as much as digits as its factorization.

21480360091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The spelling of 21480360091 in words is "twenty-one billion, four hundred eighty million, three hundred sixty thousand, ninety-one".