21126353302540 has 24 divisors (see below), whose sum is σ = 44370632062512. Its totient is φ = 8449533677760.

The previous prime is 21126353302531. The next prime is 21126353302541. The reversal of 21126353302540 is 4520335362112.

It is a self number, because there is not a number n which added to its sum of digits gives 21126353302540.

It is not an unprimeable number, because it can be changed into a prime (21126353302541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62805771 + ... + 63141250.

It is an arithmetic number, because the mean of its divisors is an integer number (1848776335938).

Almost surely, 2^{21126353302540} is an apocalyptic number.

21126353302540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21126353302540 is an abundant number, since it is smaller than the sum of its proper divisors (23244278759972).

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

21126353302540 is a wasteful number, since it uses less digits than its factorization.

21126353302540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125955417 (or 125955415 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 37.

Adding to 21126353302540 its reverse (4520335362112), we get a palindrome (25646688664652).

The spelling of 21126353302540 in words is "twenty-one trillion, one hundred twenty-six billion, three hundred fifty-three million, three hundred two thousand, five hundred forty".