20001220021210 has 48 divisors (see below), whose sum is σ = 38039912730792. Its totient is φ = 7570805299200.

The previous prime is 20001220021171. The next prime is 20001220021327. The reversal of 20001220021210 is 1212002210002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10595669499801 + 9405550521409 = 3255099^2 + 3066847^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35970 + ... + 6324850.

Almost surely, 2^{20001220021210} is an apocalyptic number.

20001220021210 is a deficient number, since it is larger than the sum of its proper divisors (18038692709582).

20001220021210 is a wasteful number, since it uses less digits than its factorization.

20001220021210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6289807 (or 6289788 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20001220021210 its reverse (1212002210002), we get a palindrome (21213222231212).

The spelling of 20001220021210 in words is "twenty trillion, one billion, two hundred twenty million, twenty-one thousand, two hundred ten".