21034213401 has 4 divisors (see below), whose sum is σ = 28045617872. Its totient is φ = 14022808932.

The previous prime is 21034213399. The next prime is 21034213427. The reversal of 21034213401 is 10431243012.

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 not a de Polignac number, because 21034213401 - 2¹ = 21034213399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21034213481) 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, 3505702231 + ... + 3505702236.

It is an arithmetic number, because the mean of its divisors is an integer number (7011404468).

Almost surely, 2^21034213401 is an apocalyptic number.

It is an amenable number.

21034213401 is a deficient number, since it is larger than the sum of its proper divisors (7011404471).

21034213401 is an equidigital number, since it uses as much as digits as its factorization.

21034213401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7011404470.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21034213401 its reverse (10431243012), we get a palindrome (31465456413).

The spelling of 21034213401 in words is "twenty-one billion, thirty-four million, two hundred thirteen thousand, four hundred one".