21070651603 has 4 divisors (see below), whose sum is σ = 21071766160. Its totient is φ = 21069537048.

The previous prime is 21070651577. The next prime is 21070651619. The reversal of 21070651603 is 30615607012.

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 21070651603 - 2¹³ = 21070643411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21070651643) 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, 528423 + ... + 566896.

It is an arithmetic number, because the mean of its divisors is an integer number (5267941540).

Almost surely, 2^21070651603 is an apocalyptic number.

21070651603 is a deficient number, since it is larger than the sum of its proper divisors (1114557).

21070651603 is a wasteful number, since it uses less digits than its factorization.

21070651603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114556.

The product of its (nonzero) digits is 7560, while the sum is 31.

The spelling of 21070651603 in words is "twenty-one billion, seventy million, six hundred fifty-one thousand, six hundred three".