21204051029 has 16 divisors (see below), whose sum is σ = 24435544320. Its totient is φ = 18023558400.

The previous prime is 21204050969. The next prime is 21204051047. The reversal of 21204051029 is 92015040212.

It is a cyclic number.

It is not a de Polignac number, because 21204051029 - 2²⁴ = 21187273813 is a prime.

It is a super-2 number, since 2×21204051029² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21204050989 and 21204051007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204051079) 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, 609887 + ... + 643715.

It is an arithmetic number, because the mean of its divisors is an integer number (1527221520).

Almost surely, 2^21204051029 is an apocalyptic number.

It is an amenable number.

21204051029 is a deficient number, since it is larger than the sum of its proper divisors (3231493291).

21204051029 is a wasteful number, since it uses less digits than its factorization.

21204051029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34580.

The product of its (nonzero) digits is 1440, while the sum is 26.

The spelling of 21204051029 in words is "twenty-one billion, two hundred four million, fifty-one thousand, twenty-nine".