12221001000021 has 32 divisors (see below), whose sum is σ = 17827275286656. Its totient is φ = 7385333760000.

The previous prime is 12221000999981. The next prime is 12221001000049. The reversal of 12221001000021 is 12000010012221.

12221001000021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12221001000021 - 2²¹ = 12220998902869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12221000999970 and 12221001000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221001040021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15631221 + ... + 16394421.

It is an arithmetic number, because the mean of its divisors is an integer number (557102352708).

Almost surely, 2^{12221001000021} is an apocalyptic number.

12221001000021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12221001000021 is a deficient number, since it is larger than the sum of its proper divisors (5606274286635).

12221001000021 is a wasteful number, since it uses less digits than its factorization.

12221001000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764613.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 12221001000021 its reverse (12000010012221), we get a palindrome (24221011012242).

The spelling of 12221001000021 in words is "twelve trillion, two hundred twenty-one billion, one million, twenty-one", and thus it is an aban number.