1020111200221 has 4 divisors (see below), whose sum is σ = 1044991961244. Its totient is φ = 995230439200.

The previous prime is 1020111200183. The next prime is 1020111200239. The reversal of 1020111200221 is 1220021110201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 391081383225 + 629029816996 = 625365^2 + 793114^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020111200221 - 2²⁵ = 1020077645789 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 (1020111200821) 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, 12440380450 + ... + 12440380531.

It is an arithmetic number, because the mean of its divisors is an integer number (261247990311).

Almost surely, 2^{1020111200221} is an apocalyptic number.

It is an amenable number.

1020111200221 is a deficient number, since it is larger than the sum of its proper divisors (24880761023).

1020111200221 is an equidigital number, since it uses as much as digits as its factorization.

1020111200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24880761022.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1020111200221 its reverse (1220021110201), we get a palindrome (2240132310422).

The spelling of 1020111200221 in words is "one trillion, twenty billion, one hundred eleven million, two hundred thousand, two hundred twenty-one".