1210002021 has 6 divisors (see below), whose sum is σ = 1747780710. Its totient is φ = 806668008.

The previous prime is 1210002019. The next prime is 1210002029. The reversal of 1210002021 is 1202000121.

It can be written as a sum of positive squares in only one way, i.e., 1013721921 + 196280100 = 31839^2 + 14010^2 .

It is not a de Polignac number, because 1210002021 - 2¹ = 1210002019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 134444669 = 1210002021 / (1 + 2 + 1 + 0 + 0 + 0 + 2 + 0 + 2 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 1210001994 and 1210002012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210002029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67222326 + ... + 67222343.

It is an arithmetic number, because the mean of its divisors is an integer number (291296785).

Almost surely, 2^1210002021 is an apocalyptic number.

It is an amenable number.

1210002021 is a deficient number, since it is larger than the sum of its proper divisors (537778689).

1210002021 is a wasteful number, since it uses less digits than its factorization.

1210002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134444675 (or 134444672 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1210002021 is about 34785.0833116725. The cubic root of 1210002021 is about 1065.6028300396.

Adding to 1210002021 its reverse (1202000121), we get a palindrome (2412002142).

The spelling of 1210002021 in words is "one billion, two hundred ten million, two thousand, twenty-one".