21213450646355 has 16 divisors (see below), whose sum is σ = 27773035164000. Its totient is φ = 15426464232960.

The previous prime is 21213450646279. The next prime is 21213450646373. The reversal of 21213450646355 is 55364605431212.

It is not a de Polignac number, because 21213450646355 - 2¹⁸ = 21213450384211 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18177380 + ... + 19309169.

It is an arithmetic number, because the mean of its divisors is an integer number (1735814697750).

Almost surely, 2^{21213450646355} is an apocalyptic number.

21213450646355 is a deficient number, since it is larger than the sum of its proper divisors (6559584517645).

21213450646355 is a wasteful number, since it uses less digits than its factorization.

21213450646355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37496854.

The product of its (nonzero) digits is 2592000, while the sum is 47.

The spelling of 21213450646355 in words is "twenty-one trillion, two hundred thirteen billion, four hundred fifty million, six hundred forty-six thousand, three hundred fifty-five".