1221212011202 has 4 divisors (see below), whose sum is σ = 1831818016806. Its totient is φ = 610606005600.

The previous prime is 1221212011157. The next prime is 1221212011259. The reversal of 1221212011202 is 2021102121221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 910136988121 + 311075023081 = 954011^2 + 557741^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305303002799 + ... + 305303002802.

Almost surely, 2^{1221212011202} is an apocalyptic number.

1221212011202 is a deficient number, since it is larger than the sum of its proper divisors (610606005604).

1221212011202 is an equidigital number, since it uses as much as digits as its factorization.

1221212011202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610606005603.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221212011202 its reverse (2021102121221), we get a palindrome (3242314132423).

The spelling of 1221212011202 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, eleven thousand, two hundred two".