1210220001221 has 16 divisors (see below), whose sum is σ = 1510284182400. Its totient is φ = 942129530880.

The previous prime is 1210220001217. The next prime is 1210220001247. The reversal of 1210220001221 is 1221000220121.

It is a cyclic number.

It is not a de Polignac number, because 1210220001221 - 2² = 1210220001217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210220001196 and 1210220001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210220006221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7410716 + ... + 7572261.

It is an arithmetic number, because the mean of its divisors is an integer number (94392761400).

Almost surely, 2^{1210220001221} is an apocalyptic number.

1210220001221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1210220001221 is a deficient number, since it is larger than the sum of its proper divisors (300064181179).

1210220001221 is a wasteful number, since it uses less digits than its factorization.

1210220001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14984044.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1210220001221 its reverse (1221000220121), we get a palindrome (2431220221342).

The spelling of 1210220001221 in words is "one trillion, two hundred ten billion, two hundred twenty million, one thousand, two hundred twenty-one".