213021253542 has 16 divisors (see below), whose sum is σ = 426275212032. Its totient is φ = 70968300360.

The previous prime is 213021253519. The next prime is 213021253567. The reversal of 213021253542 is 245352120312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9684138 + ... + 9706109.

It is an arithmetic number, because the mean of its divisors is an integer number (26642200752).

Almost surely, 2^213021253542 is an apocalyptic number.

213021253542 is an abundant number, since it is smaller than the sum of its proper divisors (213253958490).

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

213021253542 is a wasteful number, since it uses less digits than its factorization.

213021253542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19392083.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 213021253542 its reverse (245352120312), we get a palindrome (458373373854).

The spelling of 213021253542 in words is "two hundred thirteen billion, twenty-one million, two hundred fifty-three thousand, five hundred forty-two".