21142510 has 8 divisors (see below), whose sum is σ = 38056536. Its totient is φ = 8457000.

The previous prime is 21142493. The next prime is 21142529. The reversal of 21142510 is 1524112.

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

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, 1057116 + ... + 1057135.

It is an arithmetic number, because the mean of its divisors is an integer number (4757067).

Almost surely, 2^21142510 is an apocalyptic number.

21142510 is a deficient number, since it is larger than the sum of its proper divisors (16914026).

21142510 is a wasteful number, since it uses less digits than its factorization.

21142510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2114258.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 21142510 is about 4598.0985200406. The cubic root of 21142510 is about 276.5150973796.

Adding to 21142510 its reverse (1524112), we get a palindrome (22666622).

It can be divided in two parts, 2114 and 2510, that added together give a square (4624 = 68²).

The spelling of 21142510 in words is "twenty-one million, one hundred forty-two thousand, five hundred ten".