21153401040 has 80 divisors (see below), whose sum is σ = 65594069568. Its totient is φ = 5639313408.

The previous prime is 21153401033. The next prime is 21153401069. The reversal of 21153401040 is 4010435112.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 21153400998 and 21153401016.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1015207 + ... + 1035833.

Almost surely, 2^21153401040 is an apocalyptic number.

21153401040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21153401040 is an abundant number, since it is smaller than the sum of its proper divisors (44440668528).

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

21153401040 is a wasteful number, since it uses less digits than its factorization.

21153401040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24916 (or 24910 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21153401040 its reverse (4010435112), we get a palindrome (25163836152).

The spelling of 21153401040 in words is "twenty-one billion, one hundred fifty-three million, four hundred one thousand, forty".