201023021120021 has 4 divisors (see below), whose sum is σ = 201023185591200. Its totient is φ = 201022856648844.

The previous prime is 201023021119967. The next prime is 201023021120161. The reversal of 201023021120021 is 120021120320102.

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-201023021120021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201023021120221) 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, 80388401 + ... + 82851318.

It is an arithmetic number, because the mean of its divisors is an integer number (50255796397800).

Almost surely, 2^{201023021120021} is an apocalyptic number.

It is an amenable number.

201023021120021 is a deficient number, since it is larger than the sum of its proper divisors (164471179).

201023021120021 is a wasteful number, since it uses less digits than its factorization.

201023021120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164471178.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 201023021120021 its reverse (120021120320102), we get a palindrome (321044141440123).

The spelling of 201023021120021 in words is "two hundred one trillion, twenty-three billion, twenty-one million, one hundred twenty thousand, twenty-one".