21689038 has 32 divisors (see below), whose sum is σ = 38301120. Its totient is φ = 9020160.

The previous prime is 21689029. The next prime is 21689047. The reversal of 21689038 is 83098612.

It is an interprime number because it is at equal distance from previous prime (21689029) and next prime (21689047).

It is a junction number, because it is equal to n+sod(n) for n = 21688988 and 21689006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92970 + ... + 93202.

It is an arithmetic number, because the mean of its divisors is an integer number (1196910).

Almost surely, 2^21689038 is an apocalyptic number.

21689038 is a deficient number, since it is larger than the sum of its proper divisors (16612082).

21689038 is a wasteful number, since it uses less digits than its factorization.

21689038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 21689038 is about 4657.1491279537. The cubic root of 21689038 is about 278.8774700371.

The spelling of 21689038 in words is "twenty-one million, six hundred eighty-nine thousand, thirty-eight".