21002021222 has 96 divisors (see below), whose sum is σ = 41713056000. Its totient is φ = 7838897472.

The previous prime is 21002021219. The next prime is 21002021269. The reversal of 21002021222 is 22212020012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21002021197 and 21002021206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6364529 + ... + 6367827.

It is an arithmetic number, because the mean of its divisors is an integer number (434511000).

Almost surely, 2^21002021222 is an apocalyptic number.

21002021222 is a deficient number, since it is larger than the sum of its proper divisors (20711034778).

21002021222 is a wasteful number, since it uses less digits than its factorization.

21002021222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3610 (or 3603 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21002021222 its reverse (22212020012), we get a palindrome (43214041234).

The spelling of 21002021222 in words is "twenty-one billion, two million, twenty-one thousand, two hundred twenty-two".