21007102 has 4 divisors (see below), whose sum is σ = 31510656. Its totient is φ = 10503550.

The previous prime is 21007099. The next prime is 21007111. The reversal of 21007102 is 20170012.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5251774 + ... + 5251777.

It is an arithmetic number, because the mean of its divisors is an integer number (7877664).

Almost surely, 2^21007102 is an apocalyptic number.

21007102 is a deficient number, since it is larger than the sum of its proper divisors (10503554).

21007102 is a wasteful number, since it uses less digits than its factorization.

21007102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10503553.

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 21007102 is about 4583.3505211799. The cubic root of 21007102 is about 275.9235155287.

Adding to 21007102 its reverse (20170012), we get a palindrome (41177114).

The spelling of 21007102 in words is "twenty-one million, seven thousand, one hundred two".