21424051040 has 96 divisors (see below), whose sum is σ = 60360007680. Its totient is φ = 7026015744.

The previous prime is 21424051037. The next prime is 21424051067. The reversal of 21424051040 is 4015042412.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a junction number, because it is equal to n+sod(n) for n = 21424050997 and 21424051015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 390080 + ... + 441599.

It is an arithmetic number, because the mean of its divisors is an integer number (628750080).

Almost surely, 2^21424051040 is an apocalyptic number.

21424051040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21424051040 is an abundant number, since it is smaller than the sum of its proper divisors (38935956640).

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

21424051040 is a wasteful number, since it uses less digits than its factorization.

21424051040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831724 (or 831716 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 21424051040 its reverse (4015042412), we get a palindrome (25439093452).

The spelling of 21424051040 in words is "twenty-one billion, four hundred twenty-four million, fifty-one thousand, forty".