21402338 has 16 divisors (see below), whose sum is σ = 33688320. Its totient is φ = 10184400.

The previous prime is 21402331. The next prime is 21402373. The reversal of 21402338 is 83320412.

21402338 = T₈₀₇ + T₈₀₈ + ... + T₈₆₇.

It is not an unprimeable number, because it can be changed into a prime (21402331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 953 + ... + 6611.

It is an arithmetic number, because the mean of its divisors is an integer number (2105520).

Almost surely, 2^21402338 is an apocalyptic number.

21402338 is a deficient number, since it is larger than the sum of its proper divisors (12285982).

21402338 is a wasteful number, since it uses less digits than its factorization.

21402338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5753.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 21402338 is about 4626.2660969728. The cubic root of 21402338 is about 277.6432201750.

The spelling of 21402338 in words is "twenty-one million, four hundred two thousand, three hundred thirty-eight".