220001012021 has 4 divisors (see below), whose sum is σ = 251429728032. Its totient is φ = 188572296012.

The previous prime is 220001011933. The next prime is 220001012053. The reversal of 220001012021 is 120210100022.

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-220001012021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220001011993 and 220001012011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220001018021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15714357995 + ... + 15714358008.

It is an arithmetic number, because the mean of its divisors is an integer number (62857432008).

Almost surely, 2^220001012021 is an apocalyptic number.

It is an amenable number.

220001012021 is a deficient number, since it is larger than the sum of its proper divisors (31428716011).

220001012021 is an equidigital number, since it uses as much as digits as its factorization.

220001012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31428716010.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 220001012021 its reverse (120210100022), we get a palindrome (340211112043).

The spelling of 220001012021 in words is "two hundred twenty billion, one million, twelve thousand, twenty-one".