21053062040 has 64 divisors (see below), whose sum is σ = 48312180000. Its totient is φ = 8254448640.

The previous prime is 21053062033. The next prime is 21053062087. The reversal of 21053062040 is 4026035012.

It is a junction number, because it is equal to n+sod(n) for n = 21053061997 and 21053062015.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 810860 + ... + 836420.

Almost surely, 2^21053062040 is an apocalyptic number.

21053062040 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 21053062040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24156090000).

21053062040 is an abundant number, since it is smaller than the sum of its proper divisors (27259117960).

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

21053062040 is a wasteful number, since it uses less digits than its factorization.

21053062040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25980 (or 25976 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 21053062040 its reverse (4026035012), we get a palindrome (25079097052).

The spelling of 21053062040 in words is "twenty-one billion, fifty-three million, sixty-two thousand, forty".