21000023233121 has 4 divisors (see below), whose sum is σ = 21009538424832. Its totient is φ = 20990508041412.

The previous prime is 21000023233103. The next prime is 21000023233153. The reversal of 21000023233121 is 12133232000012.

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 a de Polignac number, because none of the positive numbers 2^k-21000023233121 is a prime.

It is a super-2 number, since 2×21000023233121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000023233093 and 21000023233102.

It is not an unprimeable number, because it can be changed into a prime (21000023233171) 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, 4757592545 + ... + 4757596958.

It is an arithmetic number, because the mean of its divisors is an integer number (5252384606208).

Almost surely, 2^{21000023233121} is an apocalyptic number.

It is an amenable number.

21000023233121 is a deficient number, since it is larger than the sum of its proper divisors (9515191711).

21000023233121 is an equidigital number, since it uses as much as digits as its factorization.

21000023233121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9515191710.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21000023233121 its reverse (12133232000012), we get a palindrome (33133255233133).

The spelling of 21000023233121 in words is "twenty-one trillion, twenty-three million, two hundred thirty-three thousand, one hundred twenty-one".