20013212321 has 8 divisors (see below), whose sum is σ = 20053139904. Its totient is φ = 19973313360.

The previous prime is 20013212299. The next prime is 20013212327. The reversal of 20013212321 is 12321231002.

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 20013212321 - 2⁶ = 20013212257 is a prime.

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 20013212321.

It is not an unprimeable number, because it can be changed into a prime (20013212327) 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, 1850951 + ... + 1861731.

It is an arithmetic number, because the mean of its divisors is an integer number (2506642488).

Almost surely, 2^20013212321 is an apocalyptic number.

It is an amenable number.

20013212321 is a deficient number, since it is larger than the sum of its proper divisors (39927583).

20013212321 is a wasteful number, since it uses less digits than its factorization.

20013212321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14311.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20013212321 its reverse (12321231002), we get a palindrome (32334443323).

The spelling of 20013212321 in words is "twenty billion, thirteen million, two hundred twelve thousand, three hundred twenty-one".