21361142 has 8 divisors (see below), whose sum is σ = 34954632. Its totient is φ = 9709600.

The previous prime is 21361133. The next prime is 21361147. The reversal of 21361142 is 24116312.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21361147) 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, 485459 + ... + 485502.

It is an arithmetic number, because the mean of its divisors is an integer number (4369329).

Almost surely, 2^21361142 is an apocalyptic number.

21361142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21361142 is a deficient number, since it is larger than the sum of its proper divisors (13593490).

21361142 is a wasteful number, since it uses less digits than its factorization.

21361142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970974.

The product of its digits is 288, while the sum is 20.

The square root of 21361142 is about 4621.8115495983. The cubic root of 21361142 is about 277.4649664942.

Adding to 21361142 its reverse (24116312), we get a palindrome (45477454).

It can be divided in two parts, 21 and 361142, that added together give a palindrome (361163).

The spelling of 21361142 in words is "twenty-one million, three hundred sixty-one thousand, one hundred forty-two".