21969330 has 16 divisors (see below), whose sum is σ = 52726464. Its totient is φ = 5858480.

The previous prime is 21969313. The next prime is 21969331. The reversal of 21969330 is 3396912.

It is a junction number, because it is equal to n+sod(n) for n = 21969291 and 21969300.

It is not an unprimeable number, because it can be changed into a prime (21969331) 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, 366126 + ... + 366185.

It is an arithmetic number, because the mean of its divisors is an integer number (3295404).

Almost surely, 2^21969330 is an apocalyptic number.

21969330 is an abundant number, since it is smaller than the sum of its proper divisors (30757134).

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

21969330 is a wasteful number, since it uses less digits than its factorization.

21969330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732321.

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 21969330 is about 4687.1451865715. The cubic root of 21969330 is about 280.0736625919.

The spelling of 21969330 in words is "twenty-one million, nine hundred sixty-nine thousand, three hundred thirty".