242213021 has 16 divisors (see below), whose sum is σ = 252315648. Its totient is φ = 232377600.

The previous prime is 242213009. The next prime is 242213029. The reversal of 242213021 is 120312242.

It is a cyclic number.

It is not a de Polignac number, because 242213021 - 2²⁶ = 175104157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242213029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 718565 + ... + 718901.

It is an arithmetic number, because the mean of its divisors is an integer number (15769728).

Almost surely, 2^242213021 is an apocalyptic number.

It is an amenable number.

242213021 is a deficient number, since it is larger than the sum of its proper divisors (10102627).

242213021 is a wasteful number, since it uses less digits than its factorization.

242213021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 242213021 is about 15563.1944343056. The cubic root of 242213021 is about 623.3507631096.

Adding to 242213021 its reverse (120312242), we get a palindrome (362525263).

The spelling of 242213021 in words is "two hundred forty-two million, two hundred thirteen thousand, twenty-one".