2113323561 has 32 divisors (see below), whose sum is σ = 3240980480. Its totient is φ = 1359929088.

The previous prime is 2113323551. The next prime is 2113323617. The reversal of 2113323561 is 1653233112.

It is not a de Polignac number, because 2113323561 - 2¹¹ = 2113321513 is a prime.

It is a super-2 number, since 2×2113323561² = 8932272946955441442, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2113323521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118545 + ... + 135201.

It is an arithmetic number, because the mean of its divisors is an integer number (101280640).

Almost surely, 2^2113323561 is an apocalyptic number.

It is an amenable number.

2113323561 is a deficient number, since it is larger than the sum of its proper divisors (1127656919).

2113323561 is a wasteful number, since it uses less digits than its factorization.

2113323561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16830 (or 16824 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 2113323561 is about 45970.8990666922. The cubic root of 2113323561 is about 1283.2816916458.

Adding to 2113323561 its reverse (1653233112), we get a palindrome (3766556673).

The spelling of 2113323561 in words is "two billion, one hundred thirteen million, three hundred twenty-three thousand, five hundred sixty-one".