1220102021 has 4 divisors (see below), whose sum is σ = 1220340672. Its totient is φ = 1219863372.

The previous prime is 1220102011. The next prime is 1220102033. The reversal of 1220102021 is 1202010221.

It is a happy number.

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 1220102021 - 2¹⁰ = 1220100997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220101993 and 1220102011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220102011) 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, 111485 + ... + 121938.

It is an arithmetic number, because the mean of its divisors is an integer number (305085168).

Almost surely, 2^1220102021 is an apocalyptic number.

It is an amenable number.

1220102021 is a deficient number, since it is larger than the sum of its proper divisors (238651).

1220102021 is an equidigital number, since it uses as much as digits as its factorization.

1220102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238650.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1220102021 is about 34929.9587889823. The cubic root of 1220102021 is about 1068.5595141470.

Adding to 1220102021 its reverse (1202010221), we get a palindrome (2422112242).

The spelling of 1220102021 in words is "one billion, two hundred twenty million, one hundred two thousand, twenty-one".