21236152603 has 4 divisors (see below), whose sum is σ = 21336798088. Its totient is φ = 21135507120.

The previous prime is 21236152601. The next prime is 21236152631. The reversal of 21236152603 is 30625163212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21236152603 - 2¹ = 21236152601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21236152601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50322426 + ... + 50322847.

It is an arithmetic number, because the mean of its divisors is an integer number (5334199522).

Almost surely, 2^21236152603 is an apocalyptic number.

21236152603 is a deficient number, since it is larger than the sum of its proper divisors (100645485).

21236152603 is a wasteful number, since it uses less digits than its factorization.

21236152603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100645484.

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

The spelling of 21236152603 in words is "twenty-one billion, two hundred thirty-six million, one hundred fifty-two thousand, six hundred three".