2021021210 has 32 divisors (see below), whose sum is σ = 3932303760. Its totient is φ = 743436288.

The previous prime is 2021021207. The next prime is 2021021237. The reversal of 2021021210 is 121201202.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 283215241 + 1737805969 = 16829^2 + 41687^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2021021191 and 2021021200.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6074 + ... + 63866.

Almost surely, 2^2021021210 is an apocalyptic number.

2021021210 is a deficient number, since it is larger than the sum of its proper divisors (1911282550).

2021021210 is a wasteful number, since it uses less digits than its factorization.

2021021210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58082.

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

The square root of 2021021210 is about 44955.7694851284. The cubic root of 2021021210 is about 1264.3198518421.

Adding to 2021021210 its reverse (121201202), we get a palindrome (2142222412).

The spelling of 2021021210 in words is "two billion, twenty-one million, twenty-one thousand, two hundred ten".