21450214500 has 288 divisors, whose sum is σ = 73947199872. Its totient is φ = 4799520000.

The previous prime is 21450214469. The next prime is 21450214519. The reversal of 21450214500 is 541205412.

It is a super-2 number, since 2×21450214500² (a number of 21 digits) contains 22 as substring.

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, 2354955 + ... + 2364045.

Almost surely, 2^21450214500 is an apocalyptic number.

21450214500 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 21450214500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36973599936).

21450214500 is an abundant number, since it is smaller than the sum of its proper divisors (52496985372).

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

21450214500 is a wasteful number, since it uses less digits than its factorization.

21450214500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9148 (or 9125 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

Adding to 21450214500 its reverse (541205412), we get a palindrome (21991419912).

The spelling of 21450214500 in words is "twenty-one billion, four hundred fifty million, two hundred fourteen thousand, five hundred".