21530572035 has 16 divisors (see below), whose sum is σ = 39370189056. Its totient is φ = 9842547168.

The previous prime is 21530572031. The next prime is 21530572079. The reversal of 21530572035 is 53027503512.

It is not a de Polignac number, because 21530572035 - 2² = 21530572031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21530571987 and 21530572005.

It is not an unprimeable number, because it can be changed into a prime (21530572031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102526429 + ... + 102526638.

It is an arithmetic number, because the mean of its divisors is an integer number (2460636816).

Almost surely, 2^21530572035 is an apocalyptic number.

21530572035 is a deficient number, since it is larger than the sum of its proper divisors (17839617021).

21530572035 is a wasteful number, since it uses less digits than its factorization.

21530572035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205053082.

The product of its (nonzero) digits is 31500, while the sum is 33.

The spelling of 21530572035 in words is "twenty-one billion, five hundred thirty million, five hundred seventy-two thousand, thirty-five".