21121120312 has 32 divisors (see below), whose sum is σ = 40530430080. Its totient is φ = 10314794880.

The previous prime is 21121120289. The next prime is 21121120403. The reversal of 21121120312 is 21302112112.

It is a super-2 number, since 2×21121120312² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17139 + ... + 206242.

It is an arithmetic number, because the mean of its divisors is an integer number (1266575940).

Almost surely, 2^21121120312 is an apocalyptic number.

It is an amenable number.

21121120312 is a deficient number, since it is larger than the sum of its proper divisors (19409309768).

21121120312 is a wasteful number, since it uses less digits than its factorization.

21121120312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223663 (or 223659 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21121120312 its reverse (21302112112), we get a palindrome (42423232424).

The spelling of 21121120312 in words is "twenty-one billion, one hundred twenty-one million, one hundred twenty thousand, three hundred twelve".