21104021029 has 16 divisors (see below), whose sum is σ = 25998779520. Its totient is φ = 16681872960.

The previous prime is 21104021023. The next prime is 21104021033. The reversal of 21104021029 is 92012040112.

It is a cyclic number.

It is not a de Polignac number, because 21104021029 - 2¹¹ = 21104018981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21104021023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12739 + ... + 205840.

It is an arithmetic number, because the mean of its divisors is an integer number (1624923720).

Almost surely, 2^21104021029 is an apocalyptic number.

It is an amenable number.

21104021029 is a deficient number, since it is larger than the sum of its proper divisors (4894758491).

21104021029 is a wasteful number, since it uses less digits than its factorization.

21104021029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219660.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 21104021029 in words is "twenty-one billion, one hundred four million, twenty-one thousand, twenty-nine".