31020212021 has 8 divisors (see below), whose sum is σ = 31411161600. Its totient is φ = 30630989232.

The previous prime is 31020211993. The next prime is 31020212023. The reversal of 31020212021 is 12021202013.

It is a happy number.

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 31020212021 - 2¹⁴ = 31020195637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31020211987 and 31020212005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020212023) 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, 395525 + ... + 467418.

It is an arithmetic number, because the mean of its divisors is an integer number (3926395200).

Almost surely, 2^31020212021 is an apocalyptic number.

It is an amenable number.

31020212021 is a deficient number, since it is larger than the sum of its proper divisors (390949579).

31020212021 is a wasteful number, since it uses less digits than its factorization.

31020212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863395.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 31020212021 its reverse (12021202013), we get a palindrome (43041414034).

It can be divided in two parts, 310202 and 12021, that added together give a palindrome (322223).

The spelling of 31020212021 in words is "thirty-one billion, twenty million, two hundred twelve thousand, twenty-one".