21352240115 has 16 divisors (see below), whose sum is σ = 26420694048. Its totient is φ = 16557555456.

The previous prime is 21352240093. The next prime is 21352240121. The reversal of 21352240115 is 51104225312.

It is a cyclic number.

It is not a de Polignac number, because 21352240115 - 2²² = 21348045811 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 463394 + ... + 507383.

It is an arithmetic number, because the mean of its divisors is an integer number (1651293378).

Almost surely, 2^21352240115 is an apocalyptic number.

21352240115 is a deficient number, since it is larger than the sum of its proper divisors (5068453933).

21352240115 is an equidigital number, since it uses as much as digits as its factorization.

21352240115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970918.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 21352240115 its reverse (51104225312), we get a palindrome (72456465427).

The spelling of 21352240115 in words is "twenty-one billion, three hundred fifty-two million, two hundred forty thousand, one hundred fifteen".