1202210021 has 4 divisors (see below), whose sum is σ = 1221918444. Its totient is φ = 1182501600.

The previous prime is 1202209999. The next prime is 1202210057. The reversal of 1202210021 is 1200122021.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53949025 + 1148260996 = 7345^2 + 33886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1202210021 - 2²⁶ = 1135101157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1202209984 and 1202210011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1202216021) 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, 9854120 + ... + 9854241.

It is an arithmetic number, because the mean of its divisors is an integer number (305479611).

Almost surely, 2^1202210021 is an apocalyptic number.

It is an amenable number.

1202210021 is a deficient number, since it is larger than the sum of its proper divisors (19708423).

1202210021 is an equidigital number, since it uses as much as digits as its factorization.

1202210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19708422.

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

The square root of 1202210021 is about 34672.9003834407. The cubic root of 1202210021 is about 1063.3105295983.

Adding to 1202210021 its reverse (1200122021), we get a palindrome (2402332042).

The spelling of 1202210021 in words is "one billion, two hundred two million, two hundred ten thousand, twenty-one".