2121442421 has 8 divisors (see below), whose sum is σ = 2529919104. Its totient is φ = 1739319120.

The previous prime is 2121442391. The next prime is 2121442439. The reversal of 2121442421 is 1242441212.

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

It is not a de Polignac number, because 2121442421 - 2⁶ = 2121442357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121442021) 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, 6588170 + ... + 6588491.

It is an arithmetic number, because the mean of its divisors is an integer number (316239888).

Almost surely, 2^2121442421 is an apocalyptic number.

It is an amenable number.

2121442421 is a deficient number, since it is larger than the sum of its proper divisors (408476683).

2121442421 is a wasteful number, since it uses less digits than its factorization.

2121442421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13176691.

The product of its digits is 1024, while the sum is 23.

The square root of 2121442421 is about 46059.1187605668. The cubic root of 2121442421 is about 1284.9229406671.

Adding to 2121442421 its reverse (1242441212), we get a palindrome (3363883633).

The spelling of 2121442421 in words is "two billion, one hundred twenty-one million, four hundred forty-two thousand, four hundred twenty-one".