21030120213 has 8 divisors (see below), whose sum is σ = 28569220128. Its totient is φ = 13755550224.

The previous prime is 21030120203. The next prime is 21030120233. The reversal of 21030120213 is 31202103012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21030120213 - 2⁶ = 21030120149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21030120192 and 21030120201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030120203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66132295 + ... + 66132612.

It is an arithmetic number, because the mean of its divisors is an integer number (3571152516).

Almost surely, 2^21030120213 is an apocalyptic number.

It is an amenable number.

21030120213 is a deficient number, since it is larger than the sum of its proper divisors (7539099915).

21030120213 is a wasteful number, since it uses less digits than its factorization.

21030120213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132264963.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21030120213 its reverse (31202103012), we get a palindrome (52232223225).

The spelling of 21030120213 in words is "twenty-one billion, thirty million, one hundred twenty thousand, two hundred thirteen".