2123215421 has 8 divisors (see below), whose sum is σ = 2143236480. Its totient is φ = 2103216192.

The previous prime is 2123215411. The next prime is 2123215427. The reversal of 2123215421 is 1245123212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2123215421 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 (2123215427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241916 + ... + 250538.

It is an arithmetic number, because the mean of its divisors is an integer number (267904560).

Almost surely, 2^2123215421 is an apocalyptic number.

It is an amenable number.

2123215421 is a deficient number, since it is larger than the sum of its proper divisors (20021059).

2123215421 is a wasteful number, since it uses less digits than its factorization.

2123215421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10915.

The product of its digits is 960, while the sum is 23.

The square root of 2123215421 is about 46078.3617438815. The cubic root of 2123215421 is about 1285.2808000154.

Adding to 2123215421 its reverse (1245123212), we get a palindrome (3368338633).

The spelling of 2123215421 in words is "two billion, one hundred twenty-three million, two hundred fifteen thousand, four hundred twenty-one".