21374029 has 2 divisors, whose sum is σ = 21374030. Its totient is φ = 21374028.

The previous prime is 21374021. The next prime is 21374051. The reversal of 21374029 is 92047312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17413929 + 3960100 = 4173^2 + 1990^2 .

It is a cyclic number.

It is not a de Polignac number, because 21374029 - 2³ = 21374021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21373988 and 21374006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21374021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10687014 + 10687015.

It is an arithmetic number, because the mean of its divisors is an integer number (10687015).

Almost surely, 2^21374029 is an apocalyptic number.

It is an amenable number.

21374029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21374029 is an equidigital number, since it uses as much as digits as its factorization.

21374029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 21374029 is about 4623.2054897008. The cubic root of 21374029 is about 277.5207527158.

The spelling of 21374029 in words is "twenty-one million, three hundred seventy-four thousand, twenty-nine".