21032540243 has 16 divisors (see below), whose sum is σ = 24833760000. Its totient is φ = 17560968480.

The previous prime is 21032540227. The next prime is 21032540293. The reversal of 21032540243 is 34204523012.

It is not a de Polignac number, because 21032540243 - 2⁴ = 21032540227 is a prime.

It is a super-3 number, since 3×21032540243³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21032540213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 341093 + ... + 398006.

It is an arithmetic number, because the mean of its divisors is an integer number (1552110000).

Almost surely, 2^21032540243 is an apocalyptic number.

21032540243 is a deficient number, since it is larger than the sum of its proper divisors (3801219757).

21032540243 is a wasteful number, since it uses less digits than its factorization.

21032540243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739322.

The product of its (nonzero) digits is 5760, while the sum is 26.

The spelling of 21032540243 in words is "twenty-one billion, thirty-two million, five hundred forty thousand, two hundred forty-three".