21020131331121 has 32 divisors (see below), whose sum is σ = 31495468338432. Its totient is φ = 12372888084480.

The previous prime is 21020131331119. The next prime is 21020131331131. The reversal of 21020131331121 is 12113313102012.

It is not a de Polignac number, because 21020131331121 - 2¹ = 21020131331119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21020131331131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109410681 + ... + 109602633.

It is an arithmetic number, because the mean of its divisors is an integer number (984233385576).

Almost surely, 2^{21020131331121} is an apocalyptic number.

It is an amenable number.

21020131331121 is a deficient number, since it is larger than the sum of its proper divisors (10475337007311).

21020131331121 is a wasteful number, since it uses less digits than its factorization.

21020131331121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314073.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 21020131331121 its reverse (12113313102012), we get a palindrome (33133444433133).

The spelling of 21020131331121 in words is "twenty-one trillion, twenty billion, one hundred thirty-one million, three hundred thirty-one thousand, one hundred twenty-one".