21122001115 has 16 divisors (see below), whose sum is σ = 26047945728. Its totient is φ = 16430484096.

The previous prime is 21122001071. The next prime is 21122001139. The reversal of 21122001115 is 51110022112.

It is a cyclic number.

It is not a de Polignac number, because 21122001115 - 2¹³ = 21121992923 is a prime.

It is a super-2 number, since 2×21122001115² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263014 + ... + 333796.

It is an arithmetic number, because the mean of its divisors is an integer number (1627996608).

Almost surely, 2^21122001115 is an apocalyptic number.

21122001115 is a deficient number, since it is larger than the sum of its proper divisors (4925944613).

21122001115 is a wasteful number, since it uses less digits than its factorization.

21122001115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72438.

The product of its (nonzero) digits is 40, while the sum is 16.

Adding to 21122001115 its reverse (51110022112), we get a palindrome (72232023227).

The spelling of 21122001115 in words is "twenty-one billion, one hundred twenty-two million, one thousand, one hundred fifteen".