21020101111131 has 4 divisors (see below), whose sum is σ = 28026801481512. Its totient is φ = 14013400740752.

The previous prime is 21020101111123. The next prime is 21020101111153. The reversal of 21020101111131 is 13111110102012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21020101111131 - 2³ = 21020101111123 is a prime.

It is a super-2 number, since 2×21020101111131² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21020101111131.

It is not an unprimeable number, because it can be changed into a prime (21020101111111) 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, 3503350185186 + ... + 3503350185191.

It is an arithmetic number, because the mean of its divisors is an integer number (7006700370378).

Almost surely, 2^{21020101111131} is an apocalyptic number.

21020101111131 is a deficient number, since it is larger than the sum of its proper divisors (7006700370381).

21020101111131 is an equidigital number, since it uses as much as digits as its factorization.

21020101111131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7006700370380.

The product of its (nonzero) digits is 12, while the sum is 15.

Adding to 21020101111131 its reverse (13111110102012), we get a palindrome (34131211213143).

The spelling of 21020101111131 in words is "twenty-one trillion, twenty billion, one hundred one million, one hundred eleven thousand, one hundred thirty-one".