21070142 has 8 divisors (see below), whose sum is σ = 32624832. Its totient is φ = 10195200.

The previous prime is 21070121. The next prime is 21070201. The reversal of 21070142 is 24107012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21070142.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169859 + ... + 169982.

It is an arithmetic number, because the mean of its divisors is an integer number (4078104).

Almost surely, 2^21070142 is an apocalyptic number.

21070142 is a deficient number, since it is larger than the sum of its proper divisors (11554690).

21070142 is a wasteful number, since it uses less digits than its factorization.

21070142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339874.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 21070142 is about 4590.2224346975. Note that the first 3 decimals coincide. The cubic root of 21070142 is about 276.1992452635.

Adding to 21070142 its reverse (24107012), we get a palindrome (45177154).

It can be divided in two parts, 21070 and 142, that added together give a palindrome (21212).

The spelling of 21070142 in words is "twenty-one million, seventy thousand, one hundred forty-two".