21930088 has 8 divisors (see below), whose sum is σ = 41118930. Its totient is φ = 10965040.

The previous prime is 21929993. The next prime is 21930101. The reversal of 21930088 is 88003912.

It can be written as a sum of positive squares in only one way, i.e., 21548164 + 381924 = 4642^2 + 618^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1370623 + ... + 1370638.

Almost surely, 2^21930088 is an apocalyptic number.

It is an amenable number.

21930088 is a deficient number, since it is larger than the sum of its proper divisors (19188842).

21930088 is a wasteful number, since it uses less digits than its factorization.

21930088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2741267 (or 2741263 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 21930088 is about 4682.9571853691. The cubic root of 21930088 is about 279.9068057197.

The spelling of 21930088 in words is "twenty-one million, nine hundred thirty thousand, eighty-eight".