21220000002 has 32 divisors (see below), whose sum is σ = 48781612800. Its totient is φ = 6829424784.

The previous prime is 21220000001. The next prime is 21220000019. The reversal of 21220000002 is 20000002212.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (21220000001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6773658 + ... + 6776789.

It is an arithmetic number, because the mean of its divisors is an integer number (1524425400).

Almost surely, 2^21220000002 is an apocalyptic number.

21220000002 is an abundant number, since it is smaller than the sum of its proper divisors (27561612798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21220000002 is a wasteful number, since it uses less digits than its factorization.

21220000002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13550487 (or 13550481 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

Adding to 21220000002 its reverse (20000002212), we get a palindrome (41220002214).

It can be divided in two parts, 212 and 20000002, that multiplied together give a palindrome (4240000424).

The spelling of 21220000002 in words is "twenty-one billion, two hundred twenty million, two", and thus it is an aban number.