21434250140 has 24 divisors (see below), whose sum is σ = 45015073152. Its totient is φ = 8573100480.

The previous prime is 21434250139. The next prime is 21434250157. The reversal of 21434250140 is 4105243412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 356885 + ... + 412595.

It is an arithmetic number, because the mean of its divisors is an integer number (1875628048).

Almost surely, 2^21434250140 is an apocalyptic number.

21434250140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21434250140 is an abundant number, since it is smaller than the sum of its proper divisors (23580823012).

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

21434250140 is a wasteful number, since it uses less digits than its factorization.

21434250140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74957 (or 74955 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 21434250140 its reverse (4105243412), we get a palindrome (25539493552).

The spelling of 21434250140 in words is "twenty-one billion, four hundred thirty-four million, two hundred fifty thousand, one hundred forty".