213021021111 has 8 divisors (see below), whose sum is σ = 284044103424. Its totient is φ = 142005976440.

The previous prime is 213021021061. The next prime is 213021021119. The reversal of 213021021111 is 111120120312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 213021021111 - 2⁶ = 213021021047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213021021119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1947295 + ... + 2053776.

It is an arithmetic number, because the mean of its divisors is an integer number (35505512928).

Almost surely, 2^213021021111 is an apocalyptic number.

213021021111 is a deficient number, since it is larger than the sum of its proper divisors (71023082313).

213021021111 is a wasteful number, since it uses less digits than its factorization.

213021021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4018821.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 213021021111 its reverse (111120120312), we get a palindrome (324141141423).

The spelling of 213021021111 in words is "two hundred thirteen billion, twenty-one million, twenty-one thousand, one hundred eleven".