1221212202201 has 8 divisors (see below), whose sum is σ = 1809203262560. Its totient is φ = 814141468116.

The previous prime is 1221212202193. The next prime is 1221212202209. The reversal of 1221212202201 is 1022022121221.

It is a happy number.

1221212202201 is a `hidden beast` number, since 1 + 221 + 2 + 1 + 220 + 220 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (1221212202193) and next prime (1221212202209).

It is not a de Polignac number, because 1221212202201 - 2³ = 1221212202193 is a prime.

It is a super-2 number, since 2×1221212202201² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221212202209) 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, 22615040755 + ... + 22615040808.

It is an arithmetic number, because the mean of its divisors is an integer number (226150407820).

Almost surely, 2^{1221212202201} is an apocalyptic number.

It is an amenable number.

1221212202201 is a deficient number, since it is larger than the sum of its proper divisors (587991060359).

1221212202201 is an equidigital number, since it uses as much as digits as its factorization.

1221212202201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45230081572 (or 45230081566 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1221212202201 its reverse (1022022121221), we get a palindrome (2243234323422).

The spelling of 1221212202201 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, two hundred two thousand, two hundred one".