1031213131021 has 8 divisors (see below), whose sum is σ = 1056864695544. Its totient is φ = 1005585377280.

The previous prime is 1031213131009. The next prime is 1031213131033. The reversal of 1031213131021 is 1201313121301.

It is an interprime number because it is at equal distance from previous prime (1031213131009) and next prime (1031213131033).

It can be written as a sum of positive squares in 4 ways, for example, as 143451562500 + 887761568521 = 378750^2 + 942211^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1031213131021 - 2²¹ = 1031211033869 is a prime.

It is a super-2 number, since 2×1031213131021² (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 1031213131021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031213131321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5864986 + ... + 6038251.

It is an arithmetic number, because the mean of its divisors is an integer number (132108086943).

Almost surely, 2^{1031213131021} is an apocalyptic number.

It is an amenable number.

1031213131021 is a deficient number, since it is larger than the sum of its proper divisors (25651564523).

1031213131021 is a wasteful number, since it uses less digits than its factorization.

1031213131021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11905391.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 1031213131021 its reverse (1201313121301), we get a palindrome (2232526252322).

The spelling of 1031213131021 in words is "one trillion, thirty-one billion, two hundred thirteen million, one hundred thirty-one thousand, twenty-one".