21101111101000 has 128 divisors (see below), whose sum is σ = 56597855558400. Its totient is φ = 7213198003200.

The previous prime is 21101111100959. The next prime is 21101111101003. The reversal of 21101111101000 is 10111110112.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21101111101003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2113470 + ... + 6831469.

It is an arithmetic number, because the mean of its divisors is an integer number (442170746550).

Almost surely, 2^{21101111101000} is an apocalyptic number.

21101111101000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101111101000 is an abundant number, since it is smaller than the sum of its proper divisors (35496744457400).

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

21101111101000 is a wasteful number, since it uses less digits than its factorization.

21101111101000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8945304 (or 8945290 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 10.

Adding to 21101111101000 its reverse (10111110112), we get a palindrome (21111222211112).

The spelling of 21101111101000 in words is "twenty-one trillion, one hundred one billion, one hundred eleven million, one hundred one thousand".