21033200121 has 16 divisors (see below), whose sum is σ = 28734108480. Its totient is φ = 13677351680.

The previous prime is 21033200087. The next prime is 21033200131. The reversal of 21033200121 is 12100233012.

It is a cyclic number.

It is not a de Polignac number, because 21033200121 - 2¹⁸ = 21032937977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21033200121.

It is not an unprimeable number, because it can be changed into a prime (21033200131) 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, 716101 + ... + 744893.

It is an arithmetic number, because the mean of its divisors is an integer number (1795881780).

Almost surely, 2^21033200121 is an apocalyptic number.

It is an amenable number.

21033200121 is a deficient number, since it is larger than the sum of its proper divisors (7700908359).

21033200121 is a wasteful number, since it uses less digits than its factorization.

21033200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34776.

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

Adding to 21033200121 its reverse (12100233012), we get a palindrome (33133433133).

The spelling of 21033200121 in words is "twenty-one billion, thirty-three million, two hundred thousand, one hundred twenty-one".