21211222201004 has 48 divisors (see below), whose sum is σ = 40993216387200. Its totient is φ = 9522703059840.

The previous prime is 21211222200989. The next prime is 21211222201181. The reversal of 21211222201004 is 40010222211212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12623147 + ... + 14204445.

It is an arithmetic number, because the mean of its divisors is an integer number (854025341400).

Almost surely, 2^{21211222201004} is an apocalyptic number.

It is an amenable number.

21211222201004 is a deficient number, since it is larger than the sum of its proper divisors (19781994186196).

21211222201004 is a wasteful number, since it uses less digits than its factorization.

21211222201004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585070 (or 1585068 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21211222201004 its reverse (40010222211212), we get a palindrome (61221444412216).

The spelling of 21211222201004 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty-two million, two hundred one thousand, four".