21610126 has 4 divisors (see below), whose sum is σ = 32415192. Its totient is φ = 10805062.

The previous prime is 21610103. The next prime is 21610151. The reversal of 21610126 is 62101612.

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, 5402530 + ... + 5402533.

It is an arithmetic number, because the mean of its divisors is an integer number (8103798).

Almost surely, 2^21610126 is an apocalyptic number.

21610126 is a deficient number, since it is larger than the sum of its proper divisors (10805066).

21610126 is a wasteful number, since it uses less digits than its factorization.

21610126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10805065.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 21610126 is about 4648.6692719530. The cubic root of 21610126 is about 278.5388424111.

Adding to 21610126 its reverse (62101612), we get a palindrome (83711738).

It can be divided in two parts, 21610 and 126, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 21610126 in words is "twenty-one million, six hundred ten thousand, one hundred twenty-six".