1202111021 has 16 divisors (see below), whose sum is σ = 1313489520. Its totient is φ = 1095659520.

The previous prime is 1202110979. The next prime is 1202111023. The reversal of 1202111021 is 1201112021.

It can be written as a sum of positive squares in 8 ways, for example, as 131905225 + 1070205796 = 11485^2 + 32714^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1202111021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1202110993 and 1202111011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1202111023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89195 + ... + 101783.

It is an arithmetic number, because the mean of its divisors is an integer number (82093095).

Almost surely, 2^1202111021 is an apocalyptic number.

It is an amenable number.

1202111021 is a deficient number, since it is larger than the sum of its proper divisors (111378499).

1202111021 is a wasteful number, since it uses less digits than its factorization.

1202111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12784.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1202111021 is about 34671.4727261476. The cubic root of 1202111021 is about 1063.2813415113.

Adding to 1202111021 its reverse (1201112021), we get a palindrome (2403223042).

The spelling of 1202111021 in words is "one billion, two hundred two million, one hundred eleven thousand, twenty-one".