21046956 has 48 divisors (see below), whose sum is σ = 56931840. Its totient is φ = 5927040.

The previous prime is 21046951. The next prime is 21046957. The reversal of 21046956 is 65964012.

It is not an unprimeable number, because it can be changed into a prime (21046951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4200 + ... + 7728.

It is an arithmetic number, because the mean of its divisors is an integer number (1186080).

Almost surely, 2^21046956 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21046956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28465920).

21046956 is an abundant number, since it is smaller than the sum of its proper divisors (35884884).

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

21046956 is a wasteful number, since it uses less digits than its factorization.

21046956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3614 (or 3612 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 21046956 is about 4587.6961538445. The cubic root of 21046956 is about 276.0978963793.

The spelling of 21046956 in words is "twenty-one million, forty-six thousand, nine hundred fifty-six".