7421242021 has 4 divisors (see below), whose sum is σ = 7422610912. Its totient is φ = 7419873132.

The previous prime is 7421241973. The next prime is 7421242061. The reversal of 7421242021 is 1202421247.

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 7421242021 - 2¹³ = 7421233829 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 (7421242061) 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, 676281 + ... + 687166.

It is an arithmetic number, because the mean of its divisors is an integer number (1855652728).

Almost surely, 2^7421242021 is an apocalyptic number.

It is an amenable number.

7421242021 is a deficient number, since it is larger than the sum of its proper divisors (1368891).

7421242021 is a wasteful number, since it uses less digits than its factorization.

7421242021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368890.

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 7421242021 is about 86146.6309323818. The cubic root of 7421242021 is about 1950.5579837347.

Adding to 7421242021 its reverse (1202421247), we get a palindrome (8623663268).

The spelling of 7421242021 in words is "seven billion, four hundred twenty-one million, two hundred forty-two thousand, twenty-one".