1621202210212 has 12 divisors (see below), whose sum is σ = 3055342627036. Its totient is φ = 748247173920.

The previous prime is 1621202210203. The next prime is 1621202210227. The reversal of 1621202210212 is 2120122021261.

It can be written as a sum of positive squares in 2 ways, for example, as 471812376996 + 1149389833216 = 686886^2 + 1072096^2 .

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 3 ways as a sum of consecutive naturals, for example, 15588482739 + ... + 15588482842.

Almost surely, 2^{1621202210212} is an apocalyptic number.

It is an amenable number.

1621202210212 is a deficient number, since it is larger than the sum of its proper divisors (1434140416824).

1621202210212 is a wasteful number, since it uses less digits than its factorization.

1621202210212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31176965598 (or 31176965596 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 1621202210212 its reverse (2120122021261), we get a palindrome (3741324231473).

The spelling of 1621202210212 in words is "one trillion, six hundred twenty-one billion, two hundred two million, two hundred ten thousand, two hundred twelve".