21120202121010 has 32 divisors (see below), whose sum is σ = 50690888793792. Its totient is φ = 5631786820800.

The previous prime is 21120202121009. The next prime is 21120202121087. The reversal of 21120202121010 is 1012120202112.

It is a Harshad number since it is a multiple of its sum of digits (15).

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 15 ways as a sum of consecutive naturals, for example, 16048804 + ... + 17314863.

It is an arithmetic number, because the mean of its divisors is an integer number (1584090274806).

Almost surely, 2^{21120202121010} is an apocalyptic number.

21120202121010 is an abundant number, since it is smaller than the sum of its proper divisors (29570686672782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21120202121010 is a wasteful number, since it uses less digits than its factorization.

21120202121010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33384778.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21120202121010 its reverse (1012120202112), we get a palindrome (22132322323122).

The spelling of 21120202121010 in words is "twenty-one trillion, one hundred twenty billion, two hundred two million, one hundred twenty-one thousand, ten".