21530572034 has 4 divisors (see below), whose sum is σ = 32295858054. Its totient is φ = 10765286016.

The previous prime is 21530572031. The next prime is 21530572079. The reversal of 21530572034 is 43027503512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11609416009 + 9921156025 = 107747^2 + 99605^2 .

It is a super-2 number, since 2×21530572034² (a number of 21 digits) contains 22 as substring.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5382643007 + ... + 5382643010.

Almost surely, 2^21530572034 is an apocalyptic number.

21530572034 is a deficient number, since it is larger than the sum of its proper divisors (10765286020).

21530572034 is a wasteful number, since it uses less digits than its factorization.

21530572034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10765286019.

The product of its (nonzero) digits is 25200, while the sum is 32.

The spelling of 21530572034 in words is "twenty-one billion, five hundred thirty million, five hundred seventy-two thousand, thirty-four".