21113018049 has 4 divisors (see below), whose sum is σ = 28150690736. Its totient is φ = 14075345364.

The previous prime is 21113018041. The next prime is 21113018071. The reversal of 21113018049 is 94081031112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21113018049 - 2³ = 21113018041 is a prime.

It is a super-2 number, since 2×21113018049² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21113018041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3518836339 + ... + 3518836344.

It is an arithmetic number, because the mean of its divisors is an integer number (7037672684).

Almost surely, 2^21113018049 is an apocalyptic number.

It is an amenable number.

21113018049 is a deficient number, since it is larger than the sum of its proper divisors (7037672687).

21113018049 is an equidigital number, since it uses as much as digits as its factorization.

21113018049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7037672686.

The product of its (nonzero) digits is 1728, while the sum is 30.

The spelling of 21113018049 in words is "twenty-one billion, one hundred thirteen million, eighteen thousand, forty-nine".