21200121033 has 32 divisors (see below), whose sum is σ = 35043945216. Its totient is φ = 11100837888.

The previous prime is 21200121029. The next prime is 21200121067. The reversal of 21200121033 is 33012100212.

It is not a de Polignac number, because 21200121033 - 2² = 21200121029 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21200121013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 246016 + ... + 320817.

It is an arithmetic number, because the mean of its divisors is an integer number (1095123288).

Almost surely, 2^21200121033 is an apocalyptic number.

It is an amenable number.

21200121033 is a deficient number, since it is larger than the sum of its proper divisors (13843824183).

21200121033 is a wasteful number, since it uses less digits than its factorization.

21200121033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566993.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21200121033 its reverse (33012100212), we get a palindrome (54212221245).

The spelling of 21200121033 in words is "twenty-one billion, two hundred million, one hundred twenty-one thousand, thirty-three".