20421001203 has 16 divisors (see below), whose sum is σ = 28735918080. Its totient is φ = 12863785824.

The previous prime is 20421001201. The next prime is 20421001207. The reversal of 20421001203 is 30210012402.

It is not a de Polignac number, because 20421001203 - 2¹ = 20421001201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20421001201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 445876 + ... + 489537.

It is an arithmetic number, because the mean of its divisors is an integer number (1795994880).

Almost surely, 2^20421001203 is an apocalyptic number.

20421001203 is a deficient number, since it is larger than the sum of its proper divisors (8314916877).

20421001203 is a wasteful number, since it uses less digits than its factorization.

20421001203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935818.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 20421001203 its reverse (30210012402), we get a palindrome (50631013605).

The spelling of 20421001203 in words is "twenty billion, four hundred twenty-one million, one thousand, two hundred three".