21342126 has 16 divisors (see below), whose sum is σ = 45967824. Its totient is φ = 6566784.

The previous prime is 21342119. The next prime is 21342143. The reversal of 21342126 is 62124312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136731 + ... + 136886.

It is an arithmetic number, because the mean of its divisors is an integer number (2872989).

Almost surely, 2^21342126 is an apocalyptic number.

21342126 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21342126 is an abundant number, since it is smaller than the sum of its proper divisors (24625698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21342126 is a wasteful number, since it uses less digits than its factorization.

21342126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273635.

The product of its digits is 576, while the sum is 21.

The square root of 21342126 is about 4619.7538895487. The cubic root of 21342126 is about 277.3826075977.

Adding to 21342126 its reverse (62124312), we get a palindrome (83466438).

The spelling of 21342126 in words is "twenty-one million, three hundred forty-two thousand, one hundred twenty-six".