21352464 has 160 divisors (see below), whose sum is σ = 73328640. Its totient is φ = 5816448.

The previous prime is 21352451. The next prime is 21352477. The reversal of 21352464 is 46425312.

It is an interprime number because it is at equal distance from previous prime (21352451) and next prime (21352477).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69399 + ... + 69705.

It is an arithmetic number, because the mean of its divisors is an integer number (458304).

Almost surely, 2^21352464 is an apocalyptic number.

21352464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21352464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36664320).

21352464 is an abundant number, since it is smaller than the sum of its proper divisors (51976176).

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

21352464 is a wasteful number, since it uses less digits than its factorization.

21352464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354 (or 342 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 21352464 is about 4620.8726448583. The cubic root of 21352464 is about 277.4273878679.

Adding to 21352464 its reverse (46425312), we get a palindrome (67777776).

The spelling of 21352464 in words is "twenty-one million, three hundred fifty-two thousand, four hundred sixty-four".