21000470221129 has 15 divisors (see below), whose sum is σ = 24499352793453. Its totient is φ = 18000210576348.

The previous prime is 21000470221117. The next prime is 21000470221147. The reversal of 21000470221129 is 92112207400012.

The square root of 21000470221129 is 4582627.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 21000470221129 - 2²¹ = 21000468123977 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21000470221129.

It is not an unprimeable number, because it can be changed into a prime (21000470221109) 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 14 ways as a sum of consecutive naturals, for example, 224501962 + ... + 224595484.

Almost surely, 2^{21000470221129} is an apocalyptic number.

21000470221129 is the 4582627-th square number.

21000470221129 is the 2291314-th centered octagonal number.

It is an amenable number.

21000470221129 is a deficient number, since it is larger than the sum of its proper divisors (3498882572324).

21000470221129 is an frugal number, since it uses more digits than its factorization.

21000470221129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187074 (or 93530 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The spelling of 21000470221129 in words is "twenty-one trillion, four hundred seventy million, two hundred twenty-one thousand, one hundred twenty-nine".