20211021139 has 2 divisors, whose sum is σ = 20211021140. Its totient is φ = 20211021138.

The previous prime is 20211021101. The next prime is 20211021161. The reversal of 20211021139 is 93112011202.

It is an a-pointer prime, because the next prime (20211021161) can be obtained adding 20211021139 to its sum of digits (22).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20211021139 - 2¹³ = 20211012947 is a prime.

It is a super-2 number, since 2×20211021139² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20211021739) 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 as a sum of consecutive naturals, namely, 10105510569 + 10105510570.

It is an arithmetic number, because the mean of its divisors is an integer number (10105510570).

Almost surely, 2^20211021139 is an apocalyptic number.

20211021139 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211021139 is an equidigital number, since it uses as much as digits as its factorization.

20211021139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 20211021139 in words is "twenty billion, two hundred eleven million, twenty-one thousand, one hundred thirty-nine".