21112120121010 has 64 divisors (see below), whose sum is σ = 50799086150400. Its totient is φ = 5615469400320.

The previous prime is 21112120120961. The next prime is 21112120121023. The reversal of 21112120121010 is 1012102121112.

It is a happy number.

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

It is a Curzon number.

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 31 ways as a sum of consecutive naturals, for example, 22240864 + ... + 23170676.

It is an arithmetic number, because the mean of its divisors is an integer number (793735721100).

Almost surely, 2^{21112120121010} is an apocalyptic number.

21112120121010 is an abundant number, since it is smaller than the sum of its proper divisors (29686966029390).

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

21112120121010 is a wasteful number, since it uses less digits than its factorization.

21112120121010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931763.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21112120121010 its reverse (1012102121112), we get a palindrome (22124222242122).

The spelling of 21112120121010 in words is "twenty-one trillion, one hundred twelve billion, one hundred twenty million, one hundred twenty-one thousand, ten".