1220121101231 has 4 divisors (see below), whose sum is σ = 1259479846464. Its totient is φ = 1180762356000.

The previous prime is 1220121101219. The next prime is 1220121101321. The reversal of 1220121101231 is 1321011210221.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220121101231 is a prime.

It is a super-2 number, since 2×1220121101231² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220121101131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19679372570 + ... + 19679372631.

It is an arithmetic number, because the mean of its divisors is an integer number (314869961616).

Almost surely, 2^{1220121101231} is an apocalyptic number.

1220121101231 is a deficient number, since it is larger than the sum of its proper divisors (39358745233).

1220121101231 is an equidigital number, since it uses as much as digits as its factorization.

1220121101231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39358745232.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1220121101231 its reverse (1321011210221), we get a palindrome (2541132311452).

The spelling of 1220121101231 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, one hundred one thousand, two hundred thirty-one".