21103020213 has 8 divisors (see below), whose sum is σ = 30695302176. Its totient is φ = 12789709200.

The previous prime is 21103020209. The next prime is 21103020233. The reversal of 21103020213 is 31202030112.

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

It is not a de Polignac number, because 21103020213 - 2² = 21103020209 is a prime.

It is a super-2 number, since 2×21103020213² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21103020192 and 21103020201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103020233) 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, 319742698 + ... + 319742763.

It is an arithmetic number, because the mean of its divisors is an integer number (3836912772).

Almost surely, 2^21103020213 is an apocalyptic number.

It is an amenable number.

21103020213 is a deficient number, since it is larger than the sum of its proper divisors (9592281963).

21103020213 is a wasteful number, since it uses less digits than its factorization.

21103020213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639485475.

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

Adding to 21103020213 its reverse (31202030112), we get a palindrome (52305050325).

The spelling of 21103020213 in words is "twenty-one billion, one hundred three million, twenty thousand, two hundred thirteen".