1220311121421 has 16 divisors (see below), whose sum is σ = 1859557699584. Its totient is φ = 697307144304.

The previous prime is 1220311121399. The next prime is 1220311121423. The reversal of 1220311121421 is 1241211130221.

It is not a de Polignac number, because 1220311121421 - 2¹⁰ = 1220311120397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220311121423) 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 15 ways as a sum of consecutive naturals, for example, 604816 + ... + 1675238.

It is an arithmetic number, because the mean of its divisors is an integer number (116222356224).

Almost surely, 2^{1220311121421} is an apocalyptic number.

It is an amenable number.

1220311121421 is a deficient number, since it is larger than the sum of its proper divisors (639246578163).

1220311121421 is a wasteful number, since it uses less digits than its factorization.

1220311121421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1124720.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 1220311121421 its reverse (1241211130221), we get a palindrome (2461522251642).

The spelling of 1220311121421 in words is "one trillion, two hundred twenty billion, three hundred eleven million, one hundred twenty-one thousand, four hundred twenty-one".