21301232220206 has 16 divisors (see below), whose sum is σ = 33635572997760. Its totient is φ = 10089442835640.

The previous prime is 21301232220197. The next prime is 21301232220239. The reversal of 21301232220206 is 60202223210312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16437890 + ... + 17686341.

It is an arithmetic number, because the mean of its divisors is an integer number (2102223312360).

Almost surely, 2^{21301232220206} is an apocalyptic number.

21301232220206 is a deficient number, since it is larger than the sum of its proper divisors (12334340777554).

21301232220206 is a wasteful number, since it uses less digits than its factorization.

21301232220206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34140679.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 21301232220206 its reverse (60202223210312), we get a palindrome (81503455430518).

The spelling of 21301232220206 in words is "twenty-one trillion, three hundred one billion, two hundred thirty-two million, two hundred twenty thousand, two hundred six".