21121102000000 has 112 divisors (see below), whose sum is σ = 52595825983560. Its totient is φ = 8448440000000.

The previous prime is 21121101999937. The next prime is 21121102000003. The reversal of 21121102000000 is 20112112.

It is a super-2 number, since 2×21121102000000² (a number of 27 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121102000003) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 3280276 + ... + 7280275.

Almost surely, 2^{21121102000000} is an apocalyptic number.

21121102000000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121102000000 is an abundant number, since it is smaller than the sum of its proper divisors (31474723983560).

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

21121102000000 is an frugal number, since it uses more digits than its factorization.

21121102000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10560595 (or 10560558 counting only the distinct ones).

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

Adding to 21121102000000 its reverse (20112112), we get a palindrome (21121122112112).

The spelling of 21121102000000 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred two million", and thus it is an aban number.