20010023221 has 4 divisors (see below), whose sum is σ = 20308680352. Its totient is φ = 19711366092.

The previous prime is 20010023219. The next prime is 20010023233. The reversal of 20010023221 is 12232001002.

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 20010023221 - 2¹ = 20010023219 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 (20010023521) 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, 149328465 + ... + 149328598.

It is an arithmetic number, because the mean of its divisors is an integer number (5077170088).

Almost surely, 2^20010023221 is an apocalyptic number.

It is an amenable number.

20010023221 is a deficient number, since it is larger than the sum of its proper divisors (298657131).

20010023221 is an equidigital number, since it uses as much as digits as its factorization.

20010023221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298657130.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 20010023221 its reverse (12232001002), we get a palindrome (32242024223).

The spelling of 20010023221 in words is "twenty billion, ten million, twenty-three thousand, two hundred twenty-one".