21613532026 has 4 divisors (see below), whose sum is σ = 32420298042. Its totient is φ = 10806766012.

The previous prime is 21613532021. The next prime is 21613532033. The reversal of 21613532026 is 62023531612.

It is a happy number.

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., 21613410225 + 121801 = 147015^2 + 349^2 .

It is not an unprimeable number, because it can be changed into a prime (21613532021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5403383005 + ... + 5403383008.

Almost surely, 2^21613532026 is an apocalyptic number.

21613532026 is a deficient number, since it is larger than the sum of its proper divisors (10806766016).

21613532026 is a wasteful number, since it uses less digits than its factorization.

21613532026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10806766015.

The product of its (nonzero) digits is 12960, while the sum is 31.

The spelling of 21613532026 in words is "twenty-one billion, six hundred thirteen million, five hundred thirty-two thousand, twenty-six".