1212100011221 has 8 divisors (see below), whose sum is σ = 1322337159264. Its totient is φ = 1101870569520.

The previous prime is 1212100011211. The next prime is 1212100011229. The reversal of 1212100011221 is 1221100012121.

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 1212100011221 - 2¹⁴ = 1212099994837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212100011196 and 1212100011205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212100011229) 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, 1595231 + ... + 2229116.

It is an arithmetic number, because the mean of its divisors is an integer number (165292144908).

Almost surely, 2^{1212100011221} is an apocalyptic number.

1212100011221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212100011221 is a deficient number, since it is larger than the sum of its proper divisors (110237148043).

1212100011221 is a wasteful number, since it uses less digits than its factorization.

1212100011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3853171.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1212100011221 its reverse (1221100012121), we get a palindrome (2433200023342).

The spelling of 1212100011221 in words is "one trillion, two hundred twelve billion, one hundred million, eleven thousand, two hundred twenty-one".