1220700020721 has 4 divisors (see below), whose sum is σ = 1627600027632. Its totient is φ = 813800013812.

The previous prime is 1220700020711. The next prime is 1220700020759. The reversal of 1220700020721 is 1270200070221.

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 1220700020721 - 2⁷ = 1220700020593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220700020691 and 1220700020700.

It is not an unprimeable number, because it can be changed into a prime (1220700020711) 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, 203450003451 + ... + 203450003456.

It is an arithmetic number, because the mean of its divisors is an integer number (406900006908).

Almost surely, 2^{1220700020721} is an apocalyptic number.

It is an amenable number.

1220700020721 is a deficient number, since it is larger than the sum of its proper divisors (406900006911).

1220700020721 is an equidigital number, since it uses as much as digits as its factorization.

1220700020721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406900006910.

The product of its (nonzero) digits is 784, while the sum is 24.

Adding to 1220700020721 its reverse (1270200070221), we get a palindrome (2490900090942).

The spelling of 1220700020721 in words is "one trillion, two hundred twenty billion, seven hundred million, twenty thousand, seven hundred twenty-one".