21629043 has 12 divisors (see below), whose sum is σ = 31969080. Its totient is φ = 14083776.

The previous prime is 21629029. The next prime is 21629051. The reversal of 21629043 is 34092612.

It is not a de Polignac number, because 21629043 - 2¹² = 21624947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21628998 and 21629016.

It is not an unprimeable number, because it can be changed into a prime (21629063) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27558 + ... + 28331.

It is an arithmetic number, because the mean of its divisors is an integer number (2664090).

Almost surely, 2^21629043 is an apocalyptic number.

21629043 is a deficient number, since it is larger than the sum of its proper divisors (10340037).

21629043 is a wasteful number, since it uses less digits than its factorization.

21629043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55938 (or 55935 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 21629043 is about 4650.7034951715. The cubic root of 21629043 is about 278.6200941746.

The spelling of 21629043 in words is "twenty-one million, six hundred twenty-nine thousand, forty-three".