42207621 has 4 divisors (see below), whose sum is σ = 56276832. Its totient is φ = 28138412.

The previous prime is 42207619. The next prime is 42207643. The reversal of 42207621 is 12670224.

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 42207621 - 2¹ = 42207619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42207591 and 42207600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42207611) 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, 7034601 + ... + 7034606.

It is an arithmetic number, because the mean of its divisors is an integer number (14069208).

Almost surely, 2^42207621 is an apocalyptic number.

It is an amenable number.

42207621 is a deficient number, since it is larger than the sum of its proper divisors (14069211).

42207621 is a wasteful number, since it uses less digits than its factorization.

42207621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14069210.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 42207621 is about 6496.7392590437. The cubic root of 42207621 is about 348.1744979669.

Adding to 42207621 its reverse (12670224), we get a palindrome (54877845).

The spelling of 42207621 in words is "forty-two million, two hundred seven thousand, six hundred twenty-one".