1212001000221 has 8 divisors (see below), whose sum is σ = 1762910545824. Its totient is φ = 734546060720.

The previous prime is 1212001000183. The next prime is 1212001000237. The reversal of 1212001000221 is 1220001002121.

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 1212001000221 - 2²⁷ = 1211866782493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212001000197 and 1212001000206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212001000271) 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, 18363651486 + ... + 18363651551.

It is an arithmetic number, because the mean of its divisors is an integer number (220363818228).

Almost surely, 2^{1212001000221} is an apocalyptic number.

1212001000221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212001000221 is a deficient number, since it is larger than the sum of its proper divisors (550909545603).

1212001000221 is a wasteful number, since it uses less digits than its factorization.

1212001000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36727303051.

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

Adding to 1212001000221 its reverse (1220001002121), we get a palindrome (2432002002342).

The spelling of 1212001000221 in words is "one trillion, two hundred twelve billion, one million, two hundred twenty-one", and thus it is an aban number.