4221951 has 4 divisors (see below), whose sum is σ = 5629272. Its totient is φ = 2814632.

The previous prime is 4221941. The next prime is 4221953. The reversal of 4221951 is 1591224.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 4221951 - 2¹⁰ = 4220927 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4221953) 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, 703656 + ... + 703661.

It is an arithmetic number, because the mean of its divisors is an integer number (1407318).

Almost surely, 2^4221951 is an apocalyptic number.

4221951 is a deficient number, since it is larger than the sum of its proper divisors (1407321).

4221951 is a wasteful number, since it uses less digits than its factorization.

4221951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407320.

The product of its digits is 720, while the sum is 24.

The square root of 4221951 is about 2054.7386695149. The cubic root of 4221951 is about 161.6234586529.

The spelling of 4221951 in words is "four million, two hundred twenty-one thousand, nine hundred fifty-one".