20000221012021 has 4 divisors (see below), whose sum is σ = 21052864223200. Its totient is φ = 18947577800844.

The previous prime is 20000221012003. The next prime is 20000221012081. The reversal of 20000221012021 is 12021012200002.

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 not a de Polignac number, because 20000221012021 - 2¹⁵ = 20000220979253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20000221011992 and 20000221012010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000221012081) 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, 526321605561 + ... + 526321605598.

It is an arithmetic number, because the mean of its divisors is an integer number (5263216055800).

Almost surely, 2^{20000221012021} is an apocalyptic number.

It is an amenable number.

20000221012021 is a deficient number, since it is larger than the sum of its proper divisors (1052643211179).

20000221012021 is a wasteful number, since it uses less digits than its factorization.

20000221012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052643211178.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20000221012021 its reverse (12021012200002), we get a palindrome (32021233212023).

The spelling of 20000221012021 in words is "twenty trillion, two hundred twenty-one million, twelve thousand, twenty-one".