213420737 has 4 divisors (see below), whose sum is σ = 225974916. Its totient is φ = 200866560.

The previous prime is 213420733. The next prime is 213420743. The reversal of 213420737 is 737024312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 133425601 + 79995136 = 11551^2 + 8944^2 .

It is not a de Polignac number, because 213420737 - 2² = 213420733 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213420733) 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, 6277064 + ... + 6277097.

It is an arithmetic number, because the mean of its divisors is an integer number (56493729).

Almost surely, 2^213420737 is an apocalyptic number.

It is an amenable number.

213420737 is a deficient number, since it is larger than the sum of its proper divisors (12554179).

213420737 is a wasteful number, since it uses less digits than its factorization.

213420737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12554178.

The product of its (nonzero) digits is 7056, while the sum is 29.

The square root of 213420737 is about 14608.9266203921. The cubic root of 213420737 is about 597.6022240673.

The spelling of 213420737 in words is "two hundred thirteen million, four hundred twenty thousand, seven hundred thirty-seven".