21270205040 has 80 divisors (see below), whose sum is σ = 56537756352. Its totient is φ = 7290089472.

The previous prime is 21270205037. The next prime is 21270205051. The reversal of 21270205040 is 4050207212.

It is a happy number.

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 = 21270204997 and 21270205015.

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, 2323352 + ... + 2332488.

Almost surely, 2^21270205040 is an apocalyptic number.

21270205040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21270205040 is an abundant number, since it is smaller than the sum of its proper divisors (35267551312).

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

21270205040 is a wasteful number, since it uses less digits than its factorization.

21270205040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13314 (or 13308 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 23.

The spelling of 21270205040 in words is "twenty-one billion, two hundred seventy million, two hundred five thousand, forty".