1220313021 has 8 divisors (see below), whose sum is σ = 1671059424. Its totient is φ = 791554320.

The previous prime is 1220313013. The next prime is 1220313037. The reversal of 1220313021 is 1203130221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1220313021 - 2³ = 1220313013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220313121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5496795 + ... + 5497016.

It is an arithmetic number, because the mean of its divisors is an integer number (208882428).

Almost surely, 2^1220313021 is an apocalyptic number.

It is an amenable number.

1220313021 is a deficient number, since it is larger than the sum of its proper divisors (450746403).

1220313021 is a wasteful number, since it uses less digits than its factorization.

1220313021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10993851.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1220313021 is about 34932.9789883428. The cubic root of 1220313021 is about 1068.6211081934.

Adding to 1220313021 its reverse (1203130221), we get a palindrome (2423443242).

It can be divided in two parts, 1 and 220313021, that added together give a palindrome (220313022).

The spelling of 1220313021 in words is "one billion, two hundred twenty million, three hundred thirteen thousand, twenty-one".