31021030121 has 8 divisors (see below), whose sum is σ = 32028812544. Its totient is φ = 30013691760.

The previous prime is 31021030111. The next prime is 31021030123. The reversal of 31021030121 is 12103012013.

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 31021030121 - 2¹⁰ = 31021029097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31021030096 and 31021030105.

It is not an unprimeable number, because it can be changed into a prime (31021030123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33995 + ... + 251391.

It is an arithmetic number, because the mean of its divisors is an integer number (4003601568).

Almost surely, 2^31021030121 is an apocalyptic number.

31021030121 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31021030121 is a deficient number, since it is larger than the sum of its proper divisors (1007782423).

31021030121 is a wasteful number, since it uses less digits than its factorization.

31021030121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222031.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 31021030121 its reverse (12103012013), we get a palindrome (43124042134).

The spelling of 31021030121 in words is "thirty-one billion, twenty-one million, thirty thousand, one hundred twenty-one".