21242120000 has 140 divisors (see below), whose sum is σ = 53799028800. Its totient is φ = 8315328000.

The previous prime is 21242119937. The next prime is 21242120017. The reversal of 21242120000 is 2124212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1874351 + ... + 1885649.

Almost surely, 2^21242120000 is an apocalyptic number.

21242120000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21242120000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26899514400).

21242120000 is an abundant number, since it is smaller than the sum of its proper divisors (32556908800).

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

21242120000 is an equidigital number, since it uses as much as digits as its factorization.

21242120000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11378 (or 11353 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21242120000 its reverse (2124212), we get a palindrome (21244244212).

21242120000 divided by its reverse (2124212) gives a 4-th power (10000 = 10⁴).

The spelling of 21242120000 in words is "twenty-one billion, two hundred forty-two million, one hundred twenty thousand".