21115503316242 has 24 divisors (see below), whose sum is σ = 45752572900944. Its totient is φ = 7038144841464.

The previous prime is 21115503316223. The next prime is 21115503316291. The reversal of 21115503316242 is 24261330551112.

21115503316242 is a `hidden beast` number, since 2 + 1 + 1 + 1 + 550 + 3 + 3 + 1 + 62 + 42 = 666.

It is a super-2 number, since 2×21115503316242² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21115503316197 and 21115503316206.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29323048 + ... + 30034515.

It is an arithmetic number, because the mean of its divisors is an integer number (1906357204206).

Almost surely, 2^{21115503316242} is an apocalyptic number.

21115503316242 is an abundant number, since it is smaller than the sum of its proper divisors (24637069584702).

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

21115503316242 is a wasteful number, since it uses less digits than its factorization.

21115503316242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59377334 (or 59377331 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

Adding to 21115503316242 its reverse (24261330551112), we get a palindrome (45376833867354).

The spelling of 21115503316242 in words is "twenty-one trillion, one hundred fifteen billion, five hundred three million, three hundred sixteen thousand, two hundred forty-two".