21122013213 has 24 divisors (see below), whose sum is σ = 34901370816. Its totient is φ = 12058200000.

The previous prime is 21122013191. The next prime is 21122013217. The reversal of 21122013213 is 31231022112.

It is not a de Polignac number, because 21122013213 - 2¹⁴ = 21121996829 is a prime.

It is a super-2 number, since 2×21122013213² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122013217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93288 + ... + 225713.

It is an arithmetic number, because the mean of its divisors is an integer number (1454223784).

Almost surely, 2^21122013213 is an apocalyptic number.

It is an amenable number.

21122013213 is a deficient number, since it is larger than the sum of its proper divisors (13779357603).

21122013213 is a wasteful number, since it uses less digits than its factorization.

21122013213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320065 (or 320062 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21122013213 its reverse (31231022112), we get a palindrome (52353035325).

The spelling of 21122013213 in words is "twenty-one billion, one hundred twenty-two million, thirteen thousand, two hundred thirteen".