213630501 has 16 divisors (see below), whose sum is σ = 336758400. Its totient is φ = 117864768.

The previous prime is 213630467. The next prime is 213630503. The reversal of 213630501 is 105036312.

It is not a de Polignac number, because 213630501 - 2⁹ = 213629989 is a prime.

It is a super-2 number, since 2×213630501² = 91275981915022002, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213630503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174786 + ... + 176003.

It is an arithmetic number, because the mean of its divisors is an integer number (21047400).

Almost surely, 2^213630501 is an apocalyptic number.

213630501 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

213630501 is a deficient number, since it is larger than the sum of its proper divisors (123127899).

213630501 is a wasteful number, since it uses less digits than its factorization.

213630501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350828.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 213630501 is about 14616.1041662955. The cubic root of 213630501 is about 597.7979476068.

Adding to 213630501 its reverse (105036312), we get a palindrome (318666813).

The spelling of 213630501 in words is "two hundred thirteen million, six hundred thirty thousand, five hundred one".