1321212031 has 8 divisors (see below), whose sum is σ = 1337199840. Its totient is φ = 1305249792.

The previous prime is 1321212019. The next prime is 1321212041. The reversal of 1321212031 is 1302121231.

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

It is not a de Polignac number, because 1321212031 - 2¹³ = 1321203839 is a prime.

It is a super-2 number, since 2×1321212031² = 3491202461718289922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321211996 and 1321212014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321212041) 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, 110271 + ... + 121663.

It is an arithmetic number, because the mean of its divisors is an integer number (167149980).

Almost surely, 2^1321212031 is an apocalyptic number.

1321212031 is a deficient number, since it is larger than the sum of its proper divisors (15987809).

1321212031 is a wasteful number, since it uses less digits than its factorization.

1321212031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12785.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1321212031 is about 36348.4804496694. The cubic root of 1321212031 is about 1097.2969530087.

Adding to 1321212031 its reverse (1302121231), we get a palindrome (2623333262).

The spelling of 1321212031 in words is "one billion, three hundred twenty-one million, two hundred twelve thousand, thirty-one".