21041557229 has 32 divisors (see below), whose sum is σ = 26845433856. Its totient is φ = 16015043520.

The previous prime is 21041557183. The next prime is 21041557247. The reversal of 21041557229 is 92275514012.

It is not a de Polignac number, because 21041557229 - 2²⁰ = 21040508653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21041557192 and 21041557201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041557249) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1887179 + ... + 1898295.

It is an arithmetic number, because the mean of its divisors is an integer number (838919808).

Almost surely, 2^21041557229 is an apocalyptic number.

It is an amenable number.

21041557229 is a deficient number, since it is larger than the sum of its proper divisors (5803876627).

21041557229 is a wasteful number, since it uses less digits than its factorization.

21041557229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11705.

The product of its (nonzero) digits is 50400, while the sum is 38.

The spelling of 21041557229 in words is "twenty-one billion, forty-one million, five hundred fifty-seven thousand, two hundred twenty-nine".