12212320021 has 8 divisors (see below), whose sum is σ = 13337629344. Its totient is φ = 11089527120.

The previous prime is 12212319979. The next prime is 12212320033. The reversal of 12212320021 is 12002321221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12212320021 - 2¹¹ = 12212317973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12212319977 and 12212320004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212320621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 618946 + ... + 638371.

It is an arithmetic number, because the mean of its divisors is an integer number (1667203668).

Almost surely, 2^12212320021 is an apocalyptic number.

12212320021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12212320021 is a deficient number, since it is larger than the sum of its proper divisors (1125309323).

12212320021 is a wasteful number, since it uses less digits than its factorization.

12212320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258211.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 12212320021 its reverse (12002321221), we get a palindrome (24214641242).

It can be divided in two parts, 12212 and 320021, that added together give a palindrome (332233).

The spelling of 12212320021 in words is "twelve billion, two hundred twelve million, three hundred twenty thousand, twenty-one".