213505633446 has 32 divisors (see below), whose sum is σ = 489287098368. Its totient is φ = 60842331840.

The previous prime is 213505633441. The next prime is 213505633459. The reversal of 213505633446 is 644336505312.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 213505633398 and 213505633407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213505633441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6620295 + ... + 6652466.

It is an arithmetic number, because the mean of its divisors is an integer number (15290221824).

Almost surely, 2^213505633446 is an apocalyptic number.

213505633446 is an abundant number, since it is smaller than the sum of its proper divisors (275781464922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213505633446 is a wasteful number, since it uses less digits than its factorization.

213505633446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13273156.

The product of its (nonzero) digits is 777600, while the sum is 42.

It can be divided in two parts, 213505 and 633446, that added together give a triangular number (846951 = T₁₃₀₁).

The spelling of 213505633446 in words is "two hundred thirteen billion, five hundred five million, six hundred thirty-three thousand, four hundred forty-six".