213015402 has 24 divisors (see below), whose sum is σ = 464479236. Its totient is φ = 70551936.

The previous prime is 213015391. The next prime is 213015431. The reversal of 213015402 is 204510312.

It can be written as a sum of positive squares in 2 ways, for example, as 209699361 + 3316041 = 14481^2 + 1821^2 .

It is a super-2 number, since 2×213015402² = 90751122978443208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34863 + ... + 40514.

Almost surely, 2^213015402 is an apocalyptic number.

213015402 is an abundant number, since it is smaller than the sum of its proper divisors (251463834).

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

213015402 is a wasteful number, since it uses less digits than its factorization.

213015402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75542 (or 75539 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 213015402 is about 14595.0471736134. The cubic root of 213015402 is about 597.2236563416.

Adding to 213015402 its reverse (204510312), we get a palindrome (417525714).

The spelling of 213015402 in words is "two hundred thirteen million, fifteen thousand, four hundred two".