21346556 has 36 divisors (see below), whose sum is σ = 47410776. Its totient is φ = 8316000.

The previous prime is 21346547. The next prime is 21346571. The reversal of 21346556 is 65564312.

It is a super-2 number, since 2×21346556² = 911350906122272, 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 11 ways as a sum of consecutive naturals, for example, 2795 + ... + 7106.

It is an arithmetic number, because the mean of its divisors is an integer number (1316966).

Almost surely, 2^21346556 is an apocalyptic number.

It is an amenable number.

21346556 is an abundant number, since it is smaller than the sum of its proper divisors (26064220).

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

21346556 is a wasteful number, since it uses less digits than its factorization.

21346556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9930 (or 9921 counting only the distinct ones).

The product of its digits is 21600, while the sum is 32.

The square root of 21346556 is about 4620.2333274414. The cubic root of 21346556 is about 277.4017984371.

The spelling of 21346556 in words is "twenty-one million, three hundred forty-six thousand, five hundred fifty-six".