1212202200121 has 12 divisors (see below), whose sum is σ = 1334580197076. Its totient is φ = 1100215867520.

The previous prime is 1212202200119. The next prime is 1212202200133. The reversal of 1212202200121 is 1210022022121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 163871945721 + 1048330254400 = 404811^2 + 1023880^2 .

It is not a de Polignac number, because 1212202200121 - 2¹ = 1212202200119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212202200095 and 1212202200104.

It is not an unprimeable number, because it can be changed into a prime (1212202200191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8043820 + ... + 8193133.

It is an arithmetic number, because the mean of its divisors is an integer number (111215016423).

Almost surely, 2^{1212202200121} is an apocalyptic number.

1212202200121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212202200121 is a deficient number, since it is larger than the sum of its proper divisors (122377996955).

1212202200121 is a wasteful number, since it uses less digits than its factorization.

1212202200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16237592 (or 16237581 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1212202200121 its reverse (1210022022121), we get a palindrome (2422224222242).

The spelling of 1212202200121 in words is "one trillion, two hundred twelve billion, two hundred two million, two hundred thousand, one hundred twenty-one".