21537030026 has 8 divisors (see below), whose sum is σ = 32835144324. Its totient is φ = 10591981920.

The previous prime is 21537030001. The next prime is 21537030049. The reversal of 21537030026 is 62003073512.

It is a Cunningham number, because it is equal to 146755²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 21537030025 + 1 = 146755^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 88266395 + ... + 88266638.

Almost surely, 2^21537030026 is an apocalyptic number.

21537030026 is a deficient number, since it is larger than the sum of its proper divisors (11298114298).

21537030026 is a wasteful number, since it uses less digits than its factorization.

21537030026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176533096.

The product of its (nonzero) digits is 7560, while the sum is 29.

The spelling of 21537030026 in words is "twenty-one billion, five hundred thirty-seven million, thirty thousand, twenty-six".