20321213031 has 48 divisors (see below), whose sum is σ = 34740645888. Its totient is φ = 11201068800.

The previous prime is 20321213027. The next prime is 20321213039. The reversal of 20321213031 is 13031212302.

20321213031 is a `hidden beast` number, since 20 + 321 + 21 + 303 + 1 = 666.

It is not a de Polignac number, because 20321213031 - 2² = 20321213027 is a prime.

It is a super-2 number, since 2×20321213031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20321212995 and 20321213013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321213039) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 590655 + ... + 624111.

It is an arithmetic number, because the mean of its divisors is an integer number (723763456).

Almost surely, 2^20321213031 is an apocalyptic number.

20321213031 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20321213031 is a deficient number, since it is larger than the sum of its proper divisors (14419432857).

20321213031 is a wasteful number, since it uses less digits than its factorization.

20321213031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33812 (or 33809 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 20321213031 its reverse (13031212302), we get a palindrome (33352425333).

The spelling of 20321213031 in words is "twenty billion, three hundred twenty-one million, two hundred thirteen thousand, thirty-one".