21101121231012 has 48 divisors (see below), whose sum is σ = 57585905899200. Its totient is φ = 6663511967040.

The previous prime is 21101121230963. The next prime is 21101121231049. The reversal of 21101121231012 is 21013212110112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 5141596689 + ... + 5141600792.

It is an arithmetic number, because the mean of its divisors is an integer number (1199706372900).

Almost surely, 2^{21101121231012} is an apocalyptic number.

It is an amenable number.

21101121231012 is an abundant number, since it is smaller than the sum of its proper divisors (36484784668188).

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

21101121231012 is a wasteful number, since it uses less digits than its factorization.

21101121231012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10283197513 (or 10283197505 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 21101121231012 its reverse (21013212110112), we get a palindrome (42114333341124).

The spelling of 21101121231012 in words is "twenty-one trillion, one hundred one billion, one hundred twenty-one million, two hundred thirty-one thousand, twelve".