21040212042212 has 12 divisors (see below), whose sum is σ = 40167677535216. Its totient is φ = 9563732746440.

The previous prime is 21040212042197. The next prime is 21040212042263. The reversal of 21040212042212 is 21224021204012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239093318618 + ... + 239093318705.

It is an arithmetic number, because the mean of its divisors is an integer number (3347306461268).

Almost surely, 2^{21040212042212} is an apocalyptic number.

21040212042212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21040212042212 is a deficient number, since it is larger than the sum of its proper divisors (19127465493004).

21040212042212 is a wasteful number, since it uses less digits than its factorization.

21040212042212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478186637338 (or 478186637336 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 21040212042212 its reverse (21224021204012), we get a palindrome (42264233246224).

The spelling of 21040212042212 in words is "twenty-one trillion, forty billion, two hundred twelve million, forty-two thousand, two hundred twelve".