213921649553 has 4 divisors (see below), whose sum is σ = 225180683760. Its totient is φ = 202662615348.

The previous prime is 213921649541. The next prime is 213921649561. The reversal of 213921649553 is 355946129312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213921649553 - 2⁸ = 213921649297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213921640553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5629517075 + ... + 5629517112.

It is an arithmetic number, because the mean of its divisors is an integer number (56295170940).

Almost surely, 2^213921649553 is an apocalyptic number.

It is an amenable number.

213921649553 is a deficient number, since it is larger than the sum of its proper divisors (11259034207).

213921649553 is a wasteful number, since it uses less digits than its factorization.

213921649553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11259034206.

The product of its digits is 1749600, while the sum is 50.

The spelling of 213921649553 in words is "two hundred thirteen billion, nine hundred twenty-one million, six hundred forty-nine thousand, five hundred fifty-three".