21510350000 has 120 divisors (see below), whose sum is σ = 52877771856. Its totient is φ = 8474400000.

The previous prime is 21510349979. The next prime is 21510350083. The reversal of 21510350000 is 5301512.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3346790 + ... + 3353210.

Almost surely, 2^21510350000 is an apocalyptic number.

21510350000 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 21510350000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26438885928).

21510350000 is an abundant number, since it is smaller than the sum of its proper divisors (31367421856).

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

21510350000 is an frugal number, since it uses more digits than its factorization.

21510350000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6521 (or 6495 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 17.

Adding to 21510350000 its reverse (5301512), we get a palindrome (21515651512).

The spelling of 21510350000 in words is "twenty-one billion, five hundred ten million, three hundred fifty thousand".