21819102 has 16 divisors (see below), whose sum is σ = 45046272. Its totient is φ = 7038360.

The previous prime is 21819101. The next prime is 21819121. The reversal of 21819102 is 20191812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21819101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58468 + ... + 58839.

It is an arithmetic number, because the mean of its divisors is an integer number (2815392).

Almost surely, 2^21819102 is an apocalyptic number.

21819102 is an abundant number, since it is smaller than the sum of its proper divisors (23227170).

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

21819102 is a wasteful number, since it uses less digits than its factorization.

21819102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117343.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 21819102 is about 4671.0921635095. The cubic root of 21819102 is about 279.4338133715.

The spelling of 21819102 in words is "twenty-one million, eight hundred nineteen thousand, one hundred two".