21402221213 has 8 divisors (see below), whose sum is σ = 22872964032. Its totient is φ = 19955010496.

The previous prime is 21402221201. The next prime is 21402221219. The reversal of 21402221213 is 31212220412.

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 21402221213 - 2²⁴ = 21385443997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21402221219) 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, 5881145 + ... + 5884782.

It is an arithmetic number, because the mean of its divisors is an integer number (2859120504).

Almost surely, 2^21402221213 is an apocalyptic number.

It is an amenable number.

21402221213 is a deficient number, since it is larger than the sum of its proper divisors (1470742819).

21402221213 is a wasteful number, since it uses less digits than its factorization.

21402221213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11766051.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21402221213 its reverse (31212220412), we get a palindrome (52614441625).

The spelling of 21402221213 in words is "twenty-one billion, four hundred two million, two hundred twenty-one thousand, two hundred thirteen".