21346026 has 32 divisors (see below), whose sum is σ = 46229568. Its totient is φ = 6531840.

The previous prime is 21346019. The next prime is 21346043. The reversal of 21346026 is 62064312.

It is a junction number, because it is equal to n+sod(n) for n = 21345987 and 21346005.

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, 15810 + ... + 17106.

It is an arithmetic number, because the mean of its divisors is an integer number (1444674).

Almost surely, 2^21346026 is an apocalyptic number.

21346026 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21346026 is an abundant number, since it is smaller than the sum of its proper divisors (24883542).

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

21346026 is a wasteful number, since it uses less digits than its factorization.

21346026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1526.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 21346026 is about 4620.1759706747. The cubic root of 21346026 is about 277.3995026074.

The spelling of 21346026 in words is "twenty-one million, three hundred forty-six thousand, twenty-six".