42951921 has 8 divisors (see below), whose sum is σ = 57600960. Its totient is φ = 28468752.

The previous prime is 42951917. The next prime is 42951949. The reversal of 42951921 is 12915924.

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

It is not a de Polignac number, because 42951921 - 2² = 42951917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42955921) 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, 40861 + ... + 41898.

It is an arithmetic number, because the mean of its divisors is an integer number (7200120).

Almost surely, 2^42951921 is an apocalyptic number.

It is an amenable number.

42951921 is a deficient number, since it is larger than the sum of its proper divisors (14649039).

42951921 is a wasteful number, since it uses less digits than its factorization.

42951921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82935.

The product of its digits is 6480, while the sum is 33.

The square root of 42951921 is about 6553.7715095966. The cubic root of 42951921 is about 350.2091837962.

It can be divided in two parts, 4295 and 1921, that added together give a triangular number (6216 = T₁₁₁).

The spelling of 42951921 in words is "forty-two million, nine hundred fifty-one thousand, nine hundred twenty-one".