213243051 has 48 divisors (see below), whose sum is σ = 351302400. Its totient is φ = 114472512.

The previous prime is 213243049. The next prime is 213243067. The reversal of 213243051 is 150342312.

It is not a de Polignac number, because 213243051 - 2¹ = 213243049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (213243071) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 198945 + ... + 200013.

It is an arithmetic number, because the mean of its divisors is an integer number (7318800).

Almost surely, 2^213243051 is an apocalyptic number.

213243051 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

213243051 is a deficient number, since it is larger than the sum of its proper divisors (138059349).

213243051 is a wasteful number, since it uses less digits than its factorization.

213243051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168 (or 1161 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 213243051 is about 14602.8439353436. The cubic root of 213243051 is about 597.4363310483.

Adding to 213243051 its reverse (150342312), we get a palindrome (363585363).

The spelling of 213243051 in words is "two hundred thirteen million, two hundred forty-three thousand, fifty-one".