21213348 has 96 divisors (see below), whose sum is σ = 59552640. Its totient is φ = 5806080.

The previous prime is 21213347. The next prime is 21213349. The reversal of 21213348 is 84331212.

It is an interprime number because it is at equal distance from previous prime (21213347) and next prime (21213349).

It is a super-2 number, since 2×21213348² = 900012266738208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21213341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50178 + ... + 50598.

It is an arithmetic number, because the mean of its divisors is an integer number (620340).

Almost surely, 2^21213348 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 21213348, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29776320).

21213348 is an abundant number, since it is smaller than the sum of its proper divisors (38339292).

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

21213348 is a wasteful number, since it uses less digits than its factorization.

21213348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477 (or 475 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 21213348 is about 4605.7950453749. The cubic root of 21213348 is about 276.8235744843.

The spelling of 21213348 in words is "twenty-one million, two hundred thirteen thousand, three hundred forty-eight".