21230221004 has 12 divisors (see below), whose sum is σ = 37172863728. Its totient is φ = 10609402800.

The previous prime is 21230220961. The next prime is 21230221013. The reversal of 21230221004 is 40012203212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1418552 + ... + 1433439.

It is an arithmetic number, because the mean of its divisors is an integer number (3097738644).

Almost surely, 2^21230221004 is an apocalyptic number.

It is an amenable number.

21230221004 is a deficient number, since it is larger than the sum of its proper divisors (15942642724).

21230221004 is a wasteful number, since it uses less digits than its factorization.

21230221004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2853856 (or 2853854 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21230221004 its reverse (40012203212), we get a palindrome (61242424216).

The spelling of 21230221004 in words is "twenty-one billion, two hundred thirty million, two hundred twenty-one thousand, four".