21122021213 has 8 divisors (see below), whose sum is σ = 22950923520. Its totient is φ = 19364840640.

The previous prime is 21122021197. The next prime is 21122021233. The reversal of 21122021213 is 31212022112.

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

It is a cyclic number.

It is not a de Polignac number, because 21122021213 - 2⁴ = 21122021197 is a prime.

It is a super-2 number, since 2×21122021213² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21122021191 and 21122021200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122021233) 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, 17929820 + ... + 17930997.

It is an arithmetic number, because the mean of its divisors is an integer number (2868865440).

Almost surely, 2^21122021213 is an apocalyptic number.

It is an amenable number.

21122021213 is a deficient number, since it is larger than the sum of its proper divisors (1828902307).

21122021213 is a wasteful number, since it uses less digits than its factorization.

21122021213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35860867.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21122021213 its reverse (31212022112), we get a palindrome (52334043325).

The spelling of 21122021213 in words is "twenty-one billion, one hundred twenty-two million, twenty-one thousand, two hundred thirteen".