20011212212021 has 4 divisors (see below), whose sum is σ = 20033874967392. Its totient is φ = 19988549456652.

The previous prime is 20011212211997. The next prime is 20011212212177. The reversal of 20011212212021 is 12021221211002.

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 not a de Polignac number, because 20011212212021 - 2³⁰ = 20010138470197 is a prime.

It is a super-2 number, since 2×20011212212021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011212232021) 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, 11331376361 + ... + 11331378126.

It is an arithmetic number, because the mean of its divisors is an integer number (5008468741848).

Almost surely, 2^{20011212212021} is an apocalyptic number.

It is an amenable number.

20011212212021 is a deficient number, since it is larger than the sum of its proper divisors (22662755371).

20011212212021 is an equidigital number, since it uses as much as digits as its factorization.

20011212212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22662755370.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20011212212021 its reverse (12021221211002), we get a palindrome (32032433423023).

The spelling of 20011212212021 in words is "twenty trillion, eleven billion, two hundred twelve million, two hundred twelve thousand, twenty-one".