213921649773 has 12 divisors (see below), whose sum is σ = 332767010940. Its totient is φ = 131644092096.

The previous prime is 213921649757. The next prime is 213921649789. The reversal of 213921649773 is 377946129312.

213921649773 is a `hidden beast` number, since 2 + 1 + 392 + 164 + 97 + 7 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (213921649757) and next prime (213921649789).

It can be written as a sum of positive squares in 2 ways, for example, as 11221800489 + 202699849284 = 105933^2 + 450222^2 .

It is not a de Polignac number, because 213921649773 - 2⁴ = 213921649757 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213921649373) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 914194968 + ... + 914195201.

It is an arithmetic number, because the mean of its divisors is an integer number (27730584245).

Almost surely, 2^213921649773 is an apocalyptic number.

It is an amenable number.

213921649773 is a deficient number, since it is larger than the sum of its proper divisors (118845361167).

213921649773 is a wasteful number, since it uses less digits than its factorization.

213921649773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1828390188 (or 1828390185 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 54.

The spelling of 213921649773 in words is "two hundred thirteen billion, nine hundred twenty-one million, six hundred forty-nine thousand, seven hundred seventy-three".