1201421111221 has 2 divisors, whose sum is σ = 1201421111222. Its totient is φ = 1201421111220.

The previous prime is 1201421111203. The next prime is 1201421111239. The reversal of 1201421111221 is 1221111241021.

It is a balanced prime because it is at equal distance from previous prime (1201421111203) and next prime (1201421111239).

It can be written as a sum of positive squares in only one way, i.e., 1019080155025 + 182340956196 = 1009495^2 + 427014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201421111221 is a prime.

It is a super-2 number, since 2×1201421111221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201421111291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600710555610 + 600710555611.

It is an arithmetic number, because the mean of its divisors is an integer number (600710555611).

Almost surely, 2^{1201421111221} is an apocalyptic number.

It is an amenable number.

1201421111221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201421111221 is an equidigital number, since it uses as much as digits as its factorization.

1201421111221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 1201421111221 its reverse (1221111241021), we get a palindrome (2422532352242).

The spelling of 1201421111221 in words is "one trillion, two hundred one billion, four hundred twenty-one million, one hundred eleven thousand, two hundred twenty-one".