20120021213 has 4 divisors (see below), whose sum is σ = 20994804768. Its totient is φ = 19245237660.

The previous prime is 20120021191. The next prime is 20120021293. The reversal of 20120021213 is 31212002102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20120021213 - 2¹⁶ = 20119955677 is a prime.

It is a super-2 number, since 2×20120021213² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120021293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 437391743 + ... + 437391788.

It is an arithmetic number, because the mean of its divisors is an integer number (5248701192).

Almost surely, 2^20120021213 is an apocalyptic number.

20120021213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20120021213 is a deficient number, since it is larger than the sum of its proper divisors (874783555).

20120021213 is an equidigital number, since it uses as much as digits as its factorization.

20120021213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874783554.

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

Adding to 20120021213 its reverse (31212002102), we get a palindrome (51332023315).

The spelling of 20120021213 in words is "twenty billion, one hundred twenty million, twenty-one thousand, two hundred thirteen".