21426086 has 32 divisors (see below), whose sum is σ = 37791360. Its totient is φ = 9001600.

The previous prime is 21426059. The next prime is 21426101. The reversal of 21426086 is 68062412.

21426086 = T₁₁₂₃ + T₁₁₂₄ + ... + T₁₁₅₅.

It is a super-2 number, since 2×21426086² = 918154322558792, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21581 + ... + 22551.

It is an arithmetic number, because the mean of its divisors is an integer number (1180980).

Almost surely, 2^21426086 is an apocalyptic number.

21426086 is a deficient number, since it is larger than the sum of its proper divisors (16365274).

21426086 is a wasteful number, since it uses less digits than its factorization.

21426086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 21426086 is about 4628.8320341097. The cubic root of 21426086 is about 277.7458730408.

Adding to 21426086 its reverse (68062412), we get a palindrome (89488498).

It can be divided in two parts, 2142 and 6086, that added together give a palindrome (8228).

The spelling of 21426086 in words is "twenty-one million, four hundred twenty-six thousand, eighty-six".