21829464 has 24 divisors (see below), whose sum is σ = 59121660. Its totient is φ = 7276464.

The previous prime is 21829463. The next prime is 21829477. The reversal of 21829464 is 46492812.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21829463) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 151522 + ... + 151665.

Almost surely, 2^21829464 is an apocalyptic number.

21829464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21829464 is an abundant number, since it is smaller than the sum of its proper divisors (37292196).

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

21829464 is a wasteful number, since it uses less digits than its factorization.

21829464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303199 (or 303192 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 21829464 is about 4672.2011942980. The cubic root of 21829464 is about 279.4780412065.

The spelling of 21829464 in words is "twenty-one million, eight hundred twenty-nine thousand, four hundred sixty-four".