21397343433 has 16 divisors (see below), whose sum is σ = 29115334656. Its totient is φ = 13972999040.

The previous prime is 21397343399. The next prime is 21397343453. The reversal of 21397343433 is 33434379312.

It is a cyclic number.

It is not a de Polignac number, because 21397343433 - 2¹⁶ = 21397277897 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21397343453) 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, 10953 + ... + 207158.

It is an arithmetic number, because the mean of its divisors is an integer number (1819708416).

Almost surely, 2^21397343433 is an apocalyptic number.

It is an amenable number.

21397343433 is a deficient number, since it is larger than the sum of its proper divisors (7717991223).

21397343433 is a wasteful number, since it uses less digits than its factorization.

21397343433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218784.

The product of its digits is 489888, while the sum is 42.

The spelling of 21397343433 in words is "twenty-one billion, three hundred ninety-seven million, three hundred forty-three thousand, four hundred thirty-three".