21221011012 has 12 divisors (see below), whose sum is σ = 38000415376. Its totient is φ = 10363749480.

The previous prime is 21221010997. The next prime is 21221011069. The reversal of 21221011012 is 21011012212.

It is a junction number, because it is equal to n+sod(n) for n = 21221010983 and 21221011001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61688814 + ... + 61689157.

Almost surely, 2^21221011012 is an apocalyptic number.

It is an amenable number.

21221011012 is a deficient number, since it is larger than the sum of its proper divisors (16779404364).

21221011012 is a wasteful number, since it uses less digits than its factorization.

21221011012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123378018 (or 123378016 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21221011012 its reverse (21011012212), we get a palindrome (42232023224).

It can be divided in two parts, 212 and 21011012, that multiplied together give a palindrome (4454334544).

The spelling of 21221011012 in words is "twenty-one billion, two hundred twenty-one million, eleven thousand, twelve".