21202001004 has 12 divisors (see below), whose sum is σ = 49471335704. Its totient is φ = 7067333664.

The previous prime is 21202001003. The next prime is 21202001017. The reversal of 21202001004 is 40010020212.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Harshad number since it is a multiple of its sum of digits (12), and also a Moran number because the ratio is a prime number: 1766833417 = 21202001004 / (2 + 1 + 2 + 0 + 2 + 0 + 0 + 1 + 0 + 0 + 4).

It is not an unprimeable number, because it can be changed into a prime (21202001003) 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, 883416697 + ... + 883416720.

Almost surely, 2^21202001004 is an apocalyptic number.

It is an amenable number.

21202001004 is an abundant number, since it is smaller than the sum of its proper divisors (28269334700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21202001004 is a wasteful number, since it uses less digits than its factorization.

21202001004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1766833424 (or 1766833422 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21202001004 its reverse (40010020212), we get a palindrome (61212021216).

The spelling of 21202001004 in words is "twenty-one billion, two hundred two million, one thousand, four".