42952021 has 4 divisors (see below), whose sum is σ = 49088032. Its totient is φ = 36816012.

The previous prime is 42952003. The next prime is 42952033. The reversal of 42952021 is 12025924.

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 42952021 - 2⁹ = 42951509 is a prime.

It is a super-2 number, since 2×42952021² = 3689752215968882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42950021) 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, 3067995 + ... + 3068008.

It is an arithmetic number, because the mean of its divisors is an integer number (12272008).

Almost surely, 2^42952021 is an apocalyptic number.

It is an amenable number.

42952021 is a deficient number, since it is larger than the sum of its proper divisors (6136011).

42952021 is an equidigital number, since it uses as much as digits as its factorization.

42952021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6136010.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 42952021 is about 6553.7791387870. The cubic root of 42952021 is about 350.2094555798.

Adding to 42952021 its reverse (12025924), we get a palindrome (54977945).

The spelling of 42952021 in words is "forty-two million, nine hundred fifty-two thousand, twenty-one".