20121442 has 8 divisors (see below), whose sum is σ = 32926032. Its totient is φ = 9146100.

The previous prime is 20121433. The next prime is 20121467. The reversal of 20121442 is 24412102.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457284 + ... + 457327.

It is an arithmetic number, because the mean of its divisors is an integer number (4115754).

Almost surely, 2^20121442 is an apocalyptic number.

20121442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20121442 is a deficient number, since it is larger than the sum of its proper divisors (12804590).

20121442 is a wasteful number, since it uses less digits than its factorization.

20121442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914624.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 20121442 is about 4485.6930345265. The cubic root of 20121442 is about 271.9900605509.

Adding to 20121442 its reverse (24412102), we get a palindrome (44533544).

The spelling of 20121442 in words is "twenty million, one hundred twenty-one thousand, four hundred forty-two".