21619136 has 112 divisors (see below), whose sum is σ = 55302912. Its totient is φ = 8140800.

The previous prime is 21619127. The next prime is 21619139. The reversal of 21619136 is 63191612.

It is a tau number, because it is divible by the number of its divisors (112).

It is a junction number, because it is equal to n+sod(n) for n = 21619099 and 21619108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21619139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201995 + ... + 202101.

It is an arithmetic number, because the mean of its divisors is an integer number (493776).

Almost surely, 2^21619136 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 21619136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27651456).

21619136 is an abundant number, since it is smaller than the sum of its proper divisors (33683776).

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

21619136 is a wasteful number, since it uses less digits than its factorization.

21619136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 168 counting only the distinct ones).

The product of its digits is 1944, while the sum is 29.

The square root of 21619136 is about 4649.6382654998. The cubic root of 21619136 is about 278.5775478196.

The spelling of 21619136 in words is "twenty-one million, six hundred nineteen thousand, one hundred thirty-six".