21070621003 has 4 divisors (see below), whose sum is σ = 21096667080. Its totient is φ = 21044574928.

The previous prime is 21070620983. The next prime is 21070621021. The reversal of 21070621003 is 30012607012.

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 21070621003 - 2¹³ = 21070612811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21070621063) 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, 13021825 + ... + 13023442.

It is an arithmetic number, because the mean of its divisors is an integer number (5274166770).

Almost surely, 2^21070621003 is an apocalyptic number.

21070621003 is a deficient number, since it is larger than the sum of its proper divisors (26046077).

21070621003 is an equidigital number, since it uses as much as digits as its factorization.

21070621003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26046076.

The product of its (nonzero) digits is 504, while the sum is 22.

The spelling of 21070621003 in words is "twenty-one billion, seventy million, six hundred twenty-one thousand, three".