1220021312137 has 4 divisors (see below), whose sum is σ = 1220030073360. Its totient is φ = 1220012550916.

The previous prime is 1220021312123. The next prime is 1220021312161. The reversal of 1220021312137 is 7312131200221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1220021312137 - 2¹⁵ = 1220021279369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220024312137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4168303 + ... + 4451380.

It is an arithmetic number, because the mean of its divisors is an integer number (305007518340).

Almost surely, 2^{1220021312137} is an apocalyptic number.

It is an amenable number.

1220021312137 is a deficient number, since it is larger than the sum of its proper divisors (8761223).

1220021312137 is an equidigital number, since it uses as much as digits as its factorization.

1220021312137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8761222.

The product of its (nonzero) digits is 1008, while the sum is 25.

Adding to 1220021312137 its reverse (7312131200221), we get a palindrome (8532152512358).

The spelling of 1220021312137 in words is "one trillion, two hundred twenty billion, twenty-one million, three hundred twelve thousand, one hundred thirty-seven".