21424151240 has 32 divisors (see below), whose sum is σ = 48209765760. Its totient is φ = 8568696000.

The previous prime is 21424151237. The next prime is 21424151269. The reversal of 21424151240 is 4215142412.

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, 408515 + ... + 457965.

It is an arithmetic number, because the mean of its divisors is an integer number (1506555180).

Almost surely, 2^21424151240 is an apocalyptic number.

21424151240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21424151240 is an abundant number, since it is smaller than the sum of its proper divisors (26785614520).

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

21424151240 is a wasteful number, since it uses less digits than its factorization.

21424151240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60293 (or 60289 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

Adding to 21424151240 its reverse (4215142412), we get a palindrome (25639293652).

The spelling of 21424151240 in words is "twenty-one billion, four hundred twenty-four million, one hundred fifty-one thousand, two hundred forty".