1011421331021 has 6 divisors (see below), whose sum is σ = 1074416431530. Its totient is φ = 951925958336.

The previous prime is 1011421330999. The next prime is 1011421331023. The reversal of 1011421331021 is 1201331241101.

It can be written as a sum of positive squares in 3 ways, for example, as 741302058121 + 270119272900 = 860989^2 + 519730^2 .

It is not a de Polignac number, because 1011421331021 - 2³⁰ = 1010347589197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011421330984 and 1011421331002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011421331023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1749863606 + ... + 1749864183.

It is an arithmetic number, because the mean of its divisors is an integer number (179069405255).

Almost surely, 2^{1011421331021} is an apocalyptic number.

It is an amenable number.

1011421331021 is a deficient number, since it is larger than the sum of its proper divisors (62995100509).

1011421331021 is an equidigital number, since it uses as much as digits as its factorization.

1011421331021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3499727823 (or 3499727806 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1011421331021 its reverse (1201331241101), we get a palindrome (2212752572122).

The spelling of 1011421331021 in words is "one trillion, eleven billion, four hundred twenty-one million, three hundred thirty-one thousand, twenty-one".