12212000021 has 16 divisors (see below), whose sum is σ = 13737010560. Its totient is φ = 10778201280.

The previous prime is 12211999999. The next prime is 12212000023. The reversal of 12212000021 is 12000021221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12212000021 - 2²² = 12207805717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12211999966 and 12212000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212000023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118415 + ... + 196076.

It is an arithmetic number, because the mean of its divisors is an integer number (858563160).

Almost surely, 2^12212000021 is an apocalyptic number.

It is an amenable number.

12212000021 is a deficient number, since it is larger than the sum of its proper divisors (1525010539).

12212000021 is a wasteful number, since it uses less digits than its factorization.

12212000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314636.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 12212000021 its reverse (12000021221), we get a palindrome (24212021242).

The spelling of 12212000021 in words is "twelve billion, two hundred twelve million, twenty-one", and thus it is an aban number.