1020011221001 has 4 divisors (see below), whose sum is σ = 1020055667604. Its totient is φ = 1019966774400.

The previous prime is 1020011220979. The next prime is 1020011221067. The reversal of 1020011221001 is 1001221100201.

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 808783656976 + 211227564025 = 899324^2 + 459595^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020011221001 - 2³⁴ = 1002831351817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020011221081) 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, 22188860 + ... + 22234781.

It is an arithmetic number, because the mean of its divisors is an integer number (255013916901).

Almost surely, 2^{1020011221001} is an apocalyptic number.

It is an amenable number.

1020011221001 is a deficient number, since it is larger than the sum of its proper divisors (44446603).

1020011221001 is an equidigital number, since it uses as much as digits as its factorization.

1020011221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44446602.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1020011221001 its reverse (1001221100201), we get a palindrome (2021232321202).

The spelling of 1020011221001 in words is "one trillion, twenty billion, eleven million, two hundred twenty-one thousand, one".