21202120122010 has 32 divisors (see below), whose sum is σ = 38197379824272. Its totient is φ = 8473390248960.

The previous prime is 21202120121989. The next prime is 21202120122041. The reversal of 21202120122010 is 1022102120212.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 3520002611889 + 17682117510121 = 1876167^2 + 4205011^2 .

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, 295171900 + ... + 295243720.

Almost surely, 2^{21202120122010} is an apocalyptic number.

21202120122010 is a deficient number, since it is larger than the sum of its proper divisors (16995259702262).

21202120122010 is a wasteful number, since it uses less digits than its factorization.

21202120122010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97378.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21202120122010 its reverse (1022102120212), we get a palindrome (22224222242222).

The spelling of 21202120122010 in words is "twenty-one trillion, two hundred two billion, one hundred twenty million, one hundred twenty-two thousand, ten".