20101021331 has 4 divisors (see below), whose sum is σ = 20229053472. Its totient is φ = 19972989192.

The previous prime is 20101021319. The next prime is 20101021363. The reversal of 20101021331 is 13312010102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13312010102 = 2 ⋅6656005051.

It is a cyclic number.

It is not a de Polignac number, because 20101021331 - 2²² = 20096827027 is a prime.

It is a super-2 number, since 2×20101021331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20101023331) 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 3 ways as a sum of consecutive naturals, for example, 64015835 + ... + 64016148.

It is an arithmetic number, because the mean of its divisors is an integer number (5057263368).

Almost surely, 2^20101021331 is an apocalyptic number.

20101021331 is a deficient number, since it is larger than the sum of its proper divisors (128032141).

20101021331 is a wasteful number, since it uses less digits than its factorization.

20101021331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128032140.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 20101021331 its reverse (13312010102), we get a palindrome (33413031433).

It can be divided in two parts, 2010102 and 1331, that multiplied together give a palindrome (2675445762).

The spelling of 20101021331 in words is "twenty billion, one hundred one million, twenty-one thousand, three hundred thirty-one".