21115345400044 has 48 divisors (see below), whose sum is σ = 43428463059520. Its totient is φ = 8793404375040.

The previous prime is 21115345399991. The next prime is 21115345400053. The reversal of 21115345400044 is 44000454351112.

It is a happy number.

It is a super-2 number, since 2×21115345400044² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21115345399982 and 21115345400009.

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, 12455337 + ... + 14048704.

Almost surely, 2^{21115345400044} is an apocalyptic number.

It is an amenable number.

21115345400044 is an abundant number, since it is smaller than the sum of its proper divisors (22313117659476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21115345400044 is a wasteful number, since it uses less digits than its factorization.

21115345400044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26504858 (or 26504856 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 34.

Adding to 21115345400044 its reverse (44000454351112), we get a palindrome (65115799751156).

The spelling of 21115345400044 in words is "twenty-one trillion, one hundred fifteen billion, three hundred forty-five million, four hundred thousand, forty-four".