21213605503405 has 8 divisors (see below), whose sum is σ = 29092944690432. Its totient is φ = 14546472345168.

The previous prime is 21213605503393. The next prime is 21213605503501. The reversal of 21213605503405 is 50430550631212.

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 21213605503405 - 2¹³ = 21213605495213 is a prime.

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, 303051507157 + ... + 303051507226.

It is an arithmetic number, because the mean of its divisors is an integer number (3636618086304).

Almost surely, 2^{21213605503405} is an apocalyptic number.

It is an amenable number.

21213605503405 is a deficient number, since it is larger than the sum of its proper divisors (7879339187027).

21213605503405 is an equidigital number, since it uses as much as digits as its factorization.

21213605503405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606103014395.

The product of its (nonzero) digits is 108000, while the sum is 37.

The spelling of 21213605503405 in words is "twenty-one trillion, two hundred thirteen billion, six hundred five million, five hundred three thousand, four hundred five".