21020070004 has 24 divisors (see below), whose sum is σ = 38096932608. Its totient is φ = 10141531680.

The previous prime is 21020069999. The next prime is 21020070013. The reversal of 21020070004 is 40007002012.

It is a self number, because there is not a number n which added to its sum of digits gives 21020070004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 774039 + ... + 800734.

It is an arithmetic number, because the mean of its divisors is an integer number (1587372192).

Almost surely, 2^21020070004 is an apocalyptic number.

It is an amenable number.

21020070004 is a deficient number, since it is larger than the sum of its proper divisors (17076862604).

21020070004 is a wasteful number, since it uses less digits than its factorization.

21020070004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1574895 (or 1574893 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 16.

Adding to 21020070004 its reverse (40007002012), we get a palindrome (61027072016).

The spelling of 21020070004 in words is "twenty-one billion, twenty million, seventy thousand, four".