21254430120 has 384 divisors, whose sum is σ = 81235560960. Its totient is φ = 4399127040.

The previous prime is 21254430103. The next prime is 21254430137. The reversal of 21254430120 is 2103445212.

It is an interprime number because it is at equal distance from previous prime (21254430103) and next prime (21254430137).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 22443487 + ... + 22444433.

It is an arithmetic number, because the mean of its divisors is an integer number (211550940).

Almost surely, 2^21254430120 is an apocalyptic number.

21254430120 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 21254430120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40617780480).

21254430120 is an abundant number, since it is smaller than the sum of its proper divisors (59981130840).

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

21254430120 is a wasteful number, since it uses less digits than its factorization.

21254430120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333 (or 1322 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 21254430120 its reverse (2103445212), we get a palindrome (23357875332).

The spelling of 21254430120 in words is "twenty-one billion, two hundred fifty-four million, four hundred thirty thousand, one hundred twenty".