213506232011522 has 4 divisors (see below), whose sum is σ = 320259348017286. Its totient is φ = 106753116005760.

The previous prime is 213506232011521. The next prime is 213506232011557. The reversal of 213506232011522 is 225110232605312.

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

It can be written as a sum of positive squares in only one way, i.e., 201020249341921 + 12485982669601 = 14178161^2 + 3533551^2 .

It is a super-2 number, since 2×213506232011522² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213506232011521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53376558002879 + ... + 53376558002882.

Almost surely, 2^{213506232011522} is an apocalyptic number.

213506232011522 is a deficient number, since it is larger than the sum of its proper divisors (106753116005764).

213506232011522 is a wasteful number, since it uses less digits than its factorization.

213506232011522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106753116005763.

The product of its (nonzero) digits is 43200, while the sum is 35.

Adding to 213506232011522 its reverse (225110232605312), we get a palindrome (438616464616834).

The spelling of 213506232011522 in words is "two hundred thirteen trillion, five hundred six billion, two hundred thirty-two million, eleven thousand, five hundred twenty-two".