21797468 has 96 divisors (see below), whose sum is σ = 52835328. Its totient is φ = 7603200.

The previous prime is 21797467. The next prime is 21797507. The reversal of 21797468 is 86479712.

It is a super-2 number, since 2×21797468² = 950259222422048, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21797467) 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, 120338 + ... + 120518.

It is an arithmetic number, because the mean of its divisors is an integer number (550368).

Almost surely, 2^21797468 is an apocalyptic number.

21797468 is a gapful number since it is divisible by the number (28) 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 21797468, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26417664).

21797468 is an abundant number, since it is smaller than the sum of its proper divisors (31037860).

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

21797468 is a wasteful number, since it uses less digits than its factorization.

21797468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243 (or 241 counting only the distinct ones).

The product of its digits is 169344, while the sum is 44.

The square root of 21797468 is about 4668.7758566888. The cubic root of 21797468 is about 279.3414284173.

The spelling of 21797468 in words is "twenty-one million, seven hundred ninety-seven thousand, four hundred sixty-eight".