1020021011231 has 4 divisors (see below), whose sum is σ = 1020193114512. Its totient is φ = 1019848907952.

The previous prime is 1020021011227. The next prime is 1020021011267. The reversal of 1020021011231 is 1321101200201.

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 1020021011231 - 2² = 1020021011227 is a prime.

It is a super-2 number, since 2×1020021011231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020021011131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86042750 + ... + 86054603.

It is an arithmetic number, because the mean of its divisors is an integer number (255048278628).

Almost surely, 2^{1020021011231} is an apocalyptic number.

1020021011231 is a deficient number, since it is larger than the sum of its proper divisors (172103281).

1020021011231 is an equidigital number, since it uses as much as digits as its factorization.

1020021011231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172103280.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 1020021011231 its reverse (1321101200201), we get a palindrome (2341122211432).

The spelling of 1020021011231 in words is "one trillion, twenty billion, twenty-one million, eleven thousand, two hundred thirty-one".