21102003213 has 8 divisors (see below), whose sum is σ = 28138158048. Its totient is φ = 14066925264.

The previous prime is 21102003203. The next prime is 21102003217. The reversal of 21102003213 is 31230020112.

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

It is not a de Polignac number, because 21102003213 - 2¹³ = 21101995021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21102003192 and 21102003201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102003217) 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, 222331 + ... + 302712.

It is an arithmetic number, because the mean of its divisors is an integer number (3517269756).

Almost surely, 2^21102003213 is an apocalyptic number.

It is an amenable number.

21102003213 is a deficient number, since it is larger than the sum of its proper divisors (7036154835).

21102003213 is a wasteful number, since it uses less digits than its factorization.

21102003213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538443.

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

Adding to 21102003213 its reverse (31230020112), we get a palindrome (52332023325).

The spelling of 21102003213 in words is "twenty-one billion, one hundred two million, three thousand, two hundred thirteen".