21121111112050 has 24 divisors (see below), whose sum is σ = 41352912284400. Its totient is φ = 8003789473680.

The previous prime is 21121111112039. The next prime is 21121111112051. The reversal of 21121111112050 is 5021111112112.

It is a super-2 number, since 2×21121111112050² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (21121111112051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11116373320 + ... + 11116375219.

It is an arithmetic number, because the mean of its divisors is an integer number (1723038011850).

Almost surely, 2^{21121111112050} is an apocalyptic number.

21121111112050 is a deficient number, since it is larger than the sum of its proper divisors (20231801172350).

21121111112050 is a wasteful number, since it uses less digits than its factorization.

21121111112050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22232748570 (or 22232748565 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 19.

Adding to 21121111112050 its reverse (5021111112112), we get a palindrome (26142222224162).

The spelling of 21121111112050 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred eleven million, one hundred twelve thousand, fifty".