21435502033 has 4 divisors (see below), whose sum is σ = 23384184048. Its totient is φ = 19486820020.

The previous prime is 21435502031. The next prime is 21435502037. The reversal of 21435502033 is 33020553412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21435502033 - 2¹ = 21435502031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21435501992 and 21435502010.

It is not an unprimeable number, because it can be changed into a prime (21435502031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 974340991 + ... + 974341012.

It is an arithmetic number, because the mean of its divisors is an integer number (5846046012).

Almost surely, 2^21435502033 is an apocalyptic number.

It is an amenable number.

21435502033 is a deficient number, since it is larger than the sum of its proper divisors (1948682015).

21435502033 is a wasteful number, since it uses less digits than its factorization.

21435502033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1948682014.

The product of its (nonzero) digits is 10800, while the sum is 28.

The spelling of 21435502033 in words is "twenty-one billion, four hundred thirty-five million, five hundred two thousand, thirty-three".