1021131142021 has 4 divisors (see below), whose sum is σ = 1021480011072. Its totient is φ = 1020782272972.

The previous prime is 1021131141977. The next prime is 1021131142037. The reversal of 1021131142021 is 1202411311201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1021131142021 - 2⁷ = 1021131141893 is a prime.

It is a super-2 number, since 2×1021131142021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021131142021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021131142321) 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, 174430135 + ... + 174435988.

It is an arithmetic number, because the mean of its divisors is an integer number (255370002768).

Almost surely, 2^{1021131142021} is an apocalyptic number.

It is an amenable number.

1021131142021 is a deficient number, since it is larger than the sum of its proper divisors (348869051).

1021131142021 is an equidigital number, since it uses as much as digits as its factorization.

1021131142021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348869050.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 1021131142021 its reverse (1202411311201), we get a palindrome (2223542453222).

The spelling of 1021131142021 in words is "one trillion, twenty-one billion, one hundred thirty-one million, one hundred forty-two thousand, twenty-one".