20213021011121 has 4 divisors (see below), whose sum is σ = 20514707891952. Its totient is φ = 19911334130292.

The previous prime is 20213021011067. The next prime is 20213021011123. The reversal of 20213021011121 is 12111012031202.

It is a happy number.

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-20213021011121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20213021011121.

It is not an unprimeable number, because it can be changed into a prime (20213021011123) 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, 150843440315 + ... + 150843440448.

It is an arithmetic number, because the mean of its divisors is an integer number (5128676972988).

Almost surely, 2^{20213021011121} is an apocalyptic number.

It is an amenable number.

20213021011121 is a deficient number, since it is larger than the sum of its proper divisors (301686880831).

20213021011121 is an equidigital number, since it uses as much as digits as its factorization.

20213021011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301686880830.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 20213021011121 its reverse (12111012031202), we get a palindrome (32324033042323).

The spelling of 20213021011121 in words is "twenty trillion, two hundred thirteen billion, twenty-one million, eleven thousand, one hundred twenty-one".