21120203433 has 64 divisors (see below), whose sum is σ = 35028241920. Its totient is φ = 11060582400.

The previous prime is 21120203431. The next prime is 21120203449. The reversal of 21120203433 is 33430202112.

It is not a de Polignac number, because 21120203433 - 2¹ = 21120203431 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21120203431) 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, 912423 + ... + 935283.

It is an arithmetic number, because the mean of its divisors is an integer number (547316280).

Almost surely, 2^21120203433 is an apocalyptic number.

It is an amenable number.

21120203433 is a deficient number, since it is larger than the sum of its proper divisors (13908038487).

21120203433 is a wasteful number, since it uses less digits than its factorization.

21120203433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22978.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21120203433 its reverse (33430202112), we get a palindrome (54550405545).

The spelling of 21120203433 in words is "twenty-one billion, one hundred twenty million, two hundred three thousand, four hundred thirty-three".