21033102122121 has 4 divisors (see below), whose sum is σ = 28044136162832. Its totient is φ = 14022068081412.

The previous prime is 21033102122119. The next prime is 21033102122147. The reversal of 21033102122121 is 12122120133012.

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 not a de Polignac number, because 21033102122121 - 2¹ = 21033102122119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21033102132121) 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, 3505517020351 + ... + 3505517020356.

It is an arithmetic number, because the mean of its divisors is an integer number (7011034040708).

Almost surely, 2^{21033102122121} is an apocalyptic number.

It is an amenable number.

21033102122121 is a deficient number, since it is larger than the sum of its proper divisors (7011034040711).

21033102122121 is an equidigital number, since it uses as much as digits as its factorization.

21033102122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7011034040710.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21033102122121 its reverse (12122120133012), we get a palindrome (33155222255133).

The spelling of 21033102122121 in words is "twenty-one trillion, thirty-three billion, one hundred two million, one hundred twenty-two thousand, one hundred twenty-one".