1020000012221 has 4 divisors (see below), whose sum is σ = 1020798760572. Its totient is φ = 1019201263872.

The previous prime is 1020000012217. The next prime is 1020000012233. The reversal of 1020000012221 is 1222100000201.

It is a happy number.

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 417653280121 + 602346732100 = 646261^2 + 776110^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020000012221 - 2² = 1020000012217 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 (1020000012721) 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, 399372260 + ... + 399374813.

It is an arithmetic number, because the mean of its divisors is an integer number (255199690143).

Almost surely, 2^{1020000012221} is an apocalyptic number.

It is an amenable number.

1020000012221 is a deficient number, since it is larger than the sum of its proper divisors (798748351).

1020000012221 is an equidigital number, since it uses as much as digits as its factorization.

1020000012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798748350.

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

Adding to 1020000012221 its reverse (1222100000201), we get a palindrome (2242100012422).

The spelling of 1020000012221 in words is "one trillion, twenty billion, twelve thousand, two hundred twenty-one".