21121112102010 has 32 divisors (see below), whose sum is σ = 50725700710272. Its totient is φ = 5628404153280.

The previous prime is 21121112101981. The next prime is 21121112102063. The reversal of 21121112102010 is 1020121112112.

It is a happy number.

It is a super-2 number, since 2×21121112102010² (a number of 27 digits) contains 22 as substring.

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

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, 243231321 + ... + 243318140.

It is an arithmetic number, because the mean of its divisors is an integer number (1585178147196).

Almost surely, 2^{21121112102010} is an apocalyptic number.

21121112102010 is an abundant number, since it is smaller than the sum of its proper divisors (29604588608262).

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

21121112102010 is a wasteful number, since it uses less digits than its factorization.

21121112102010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486550918.

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

Adding to 21121112102010 its reverse (1020121112112), we get a palindrome (22141233214122).

The spelling of 21121112102010 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twelve million, one hundred two thousand, ten".