21929027 has 2 divisors, whose sum is σ = 21929028. Its totient is φ = 21929026.

The previous prime is 21929023. The next prime is 21929041. The reversal of 21929027 is 72092912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21929027 - 2² = 21929023 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21928984 and 21929002.

It is not a weakly prime, because it can be changed into another prime (21929023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10964513 + 10964514.

It is an arithmetic number, because the mean of its divisors is an integer number (10964514).

Almost surely, 2^21929027 is an apocalyptic number.

21929027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21929027 is an equidigital number, since it uses as much as digits as its factorization.

21929027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 21929027 is about 4682.8439008790. The cubic root of 21929027 is about 279.9022915880.

The spelling of 21929027 in words is "twenty-one million, nine hundred twenty-nine thousand, twenty-seven".