213231572 has 6 divisors (see below), whose sum is σ = 373155258. Its totient is φ = 106615784.

The previous prime is 213231521. The next prime is 213231583. The reversal of 213231572 is 275132312.

It can be written as a sum of positive squares in only one way, i.e., 213043216 + 188356 = 14596^2 + 434^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26653943 + ... + 26653950.

It is an arithmetic number, because the mean of its divisors is an integer number (62192543).

Almost surely, 2^213231572 is an apocalyptic number.

It is an amenable number.

213231572 is a deficient number, since it is larger than the sum of its proper divisors (159923686).

213231572 is a wasteful number, since it uses less digits than its factorization.

213231572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53307897 (or 53307895 counting only the distinct ones).

The product of its digits is 2520, while the sum is 26.

The square root of 213231572 is about 14602.4508901759. The cubic root of 213231572 is about 597.4256107385.

Adding to 213231572 its reverse (275132312), we get a palindrome (488363884).

The spelling of 213231572 in words is "two hundred thirteen million, two hundred thirty-one thousand, five hundred seventy-two".