21212301311212 has 24 divisors (see below), whose sum is σ = 40496435546112. Its totient is φ = 9641901819600.

The previous prime is 21212301311203. The next prime is 21212301311239. The reversal of 21212301311212 is 21211310321212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

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, 7349037 + ... + 9820027.

It is an arithmetic number, because the mean of its divisors is an integer number (1687351481088).

Almost surely, 2^{21212301311212} is an apocalyptic number.

21212301311212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21212301311212 is a deficient number, since it is larger than the sum of its proper divisors (19284134234900).

21212301311212 is a wasteful number, since it uses less digits than its factorization.

21212301311212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2666109 (or 2666107 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 21212301311212 its reverse (21211310321212), we get a palindrome (42423611632424).

The spelling of 21212301311212 in words is "twenty-one trillion, two hundred twelve billion, three hundred one million, three hundred eleven thousand, two hundred twelve".