21022123213 has 16 divisors (see below), whose sum is σ = 26070903936. Its totient is φ = 16505910720.

The previous prime is 21022123193. The next prime is 21022123223. The reversal of 21022123213 is 31232122012.

It is not a de Polignac number, because 21022123213 - 2²¹ = 21020026061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022123223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 869806 + ... + 893647.

It is an arithmetic number, because the mean of its divisors is an integer number (1629431496).

Almost surely, 2^21022123213 is an apocalyptic number.

It is an amenable number.

21022123213 is a deficient number, since it is larger than the sum of its proper divisors (5048780723).

21022123213 is a wasteful number, since it uses less digits than its factorization.

21022123213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1763604.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21022123213 its reverse (31232122012), we get a palindrome (52254245225).

The spelling of 21022123213 in words is "twenty-one billion, twenty-two million, one hundred twenty-three thousand, two hundred thirteen".