21121102000 has 40 divisors (see below), whose sum is σ = 51070829472. Its totient is φ = 8448440000.

The previous prime is 21121101997. The next prime is 21121102049. The reversal of 21121102000 is 20112112.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×21121102000² (a number of 21 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5278276 + ... + 5282275.

Almost surely, 2^21121102000 is an apocalyptic number.

21121102000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121102000 is an abundant number, since it is smaller than the sum of its proper divisors (29949727472).

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

21121102000 is a wasteful number, since it uses less digits than its factorization.

21121102000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10560574 (or 10560558 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21121102000 its reverse (20112112), we get a palindrome (21141214112).

The spelling of 21121102000 in words is "twenty-one billion, one hundred twenty-one million, one hundred two thousand".