21202222012 has 12 divisors (see below), whose sum is σ = 37115131480. Its totient is φ = 10597898736.

The previous prime is 21202222009. The next prime is 21202222021. The reversal of 21202222012 is 21022220212.

It is a super-2 number, since 2×21202222012² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 788187 + ... + 814642.

Almost surely, 2^21202222012 is an apocalyptic number.

It is an amenable number.

21202222012 is a deficient number, since it is larger than the sum of its proper divisors (15912909468).

21202222012 is a wasteful number, since it uses less digits than its factorization.

21202222012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606140 (or 1606138 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21202222012 its reverse (21022220212), we get a palindrome (42224442224).

The spelling of 21202222012 in words is "twenty-one billion, two hundred two million, two hundred twenty-two thousand, twelve".