21235527040 has 128 divisors (see below), whose sum is σ = 62481625920. Its totient is φ = 6720675840.

The previous prime is 21235527017. The next prime is 21235527091. The reversal of 21235527040 is 4072553212.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 21235526993 and 21235527011.

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, 124071 + ... + 240550.

Almost surely, 2^21235527040 is an apocalyptic number.

21235527040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21235527040 is an abundant number, since it is smaller than the sum of its proper divisors (41246098880).

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

21235527040 is a wasteful number, since it uses less digits than its factorization.

21235527040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364660 (or 364648 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 31.

The spelling of 21235527040 in words is "twenty-one billion, two hundred thirty-five million, five hundred twenty-seven thousand, forty".