213434012021 has 4 divisors (see below), whose sum is σ = 214327041600. Its totient is φ = 212540982444.

The previous prime is 213434011991. The next prime is 213434012027. The reversal of 213434012021 is 120210434312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213434012021 - 2⁶ = 213434011957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213434012027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 446514431 + ... + 446514908.

It is an arithmetic number, because the mean of its divisors is an integer number (53581760400).

Almost surely, 2^213434012021 is an apocalyptic number.

It is an amenable number.

213434012021 is a deficient number, since it is larger than the sum of its proper divisors (893029579).

213434012021 is an equidigital number, since it uses as much as digits as its factorization.

213434012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893029578.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 213434012021 its reverse (120210434312), we get a palindrome (333644446333).

The spelling of 213434012021 in words is "two hundred thirteen billion, four hundred thirty-four million, twelve thousand, twenty-one".