21115345400043 has 32 divisors (see below), whose sum is σ = 30119045562432. Its totient is φ = 13111567872000.

The previous prime is 21115345399991. The next prime is 21115345400053. The reversal of 21115345400043 is 34000454351112.

It is not a de Polignac number, because 21115345400043 - 2³⁷ = 20977906446571 is a prime.

It is a super-2 number, since 2×21115345400043² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21115345399977 and 21115345400013.

It is not an unprimeable number, because it can be changed into a prime (21115345400053) 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, 10138113 + ... + 12042093.

It is an arithmetic number, because the mean of its divisors is an integer number (941220173826).

Almost surely, 2^{21115345400043} is an apocalyptic number.

21115345400043 is a deficient number, since it is larger than the sum of its proper divisors (9003700162389).

21115345400043 is a wasteful number, since it uses less digits than its factorization.

21115345400043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1906255.

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 21115345400043 its reverse (34000454351112), we get a palindrome (55115799751155).

The spelling of 21115345400043 in words is "twenty-one trillion, one hundred fifteen billion, three hundred forty-five million, four hundred thousand, forty-three".