21350672 has 60 divisors (see below), whose sum is σ = 48747996. Its totient is φ = 9031680.

The previous prime is 21350633. The next prime is 21350677. The reversal of 21350672 is 27605312.

It can be written as a sum of positive squares in 2 ways, for example, as 6635776 + 14714896 = 2576^2 + 3836^2 .

It is not an unprimeable number, because it can be changed into a prime (21350677) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88472 + ... + 88712.

Almost surely, 2^21350672 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 21350672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24373998).

21350672 is an abundant number, since it is smaller than the sum of its proper divisors (27397324).

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

21350672 is a wasteful number, since it uses less digits than its factorization.

21350672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376 (or 363 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 21350672 is about 4620.6787380211. The cubic root of 21350672 is about 277.4196266436.

Adding to 21350672 its reverse (27605312), we get a palindrome (48955984).

It can be divided in two parts, 21350 and 672, that added together give a palindrome (22022).

The spelling of 21350672 in words is "twenty-one million, three hundred fifty thousand, six hundred seventy-two".