213554225506 has 4 divisors (see below), whose sum is σ = 320331338262. Its totient is φ = 106777112752.

The previous prime is 213554225497. The next prime is 213554225531. The reversal of 213554225506 is 605522455312.

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., 207989811481 + 5564414025 = 456059^2 + 74595^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53388556375 + ... + 53388556378.

Almost surely, 2^213554225506 is an apocalyptic number.

213554225506 is a deficient number, since it is larger than the sum of its proper divisors (106777112756).

213554225506 is a wasteful number, since it uses less digits than its factorization.

213554225506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106777112755.

The product of its (nonzero) digits is 360000, while the sum is 40.

The spelling of 213554225506 in words is "two hundred thirteen billion, five hundred fifty-four million, two hundred twenty-five thousand, five hundred six".