21057893703 has 64 divisors (see below), whose sum is σ = 38942346240. Its totient is φ = 10925798400.

The previous prime is 21057893699. The next prime is 21057893713. The reversal of 21057893703 is 30739875012.

It is a happy number.

21057893703 is a `hidden beast` number, since 2 + 1 + 0 + 578 + 9 + 3 + 70 + 3 = 666.

It is not a de Polignac number, because 21057893703 - 2² = 21057893699 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21057893713) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1825851 + ... + 1837347.

It is an arithmetic number, because the mean of its divisors is an integer number (608474160).

Almost surely, 2^21057893703 is an apocalyptic number.

21057893703 is a deficient number, since it is larger than the sum of its proper divisors (17884452537).

21057893703 is a wasteful number, since it uses less digits than its factorization.

21057893703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12405 (or 12399 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The spelling of 21057893703 in words is "twenty-one billion, fifty-seven million, eight hundred ninety-three thousand, seven hundred three".