21221123202 has 32 divisors (see below), whose sum is σ = 47644228800. Its totient is φ = 7000781184.

The previous prime is 21221123159. The next prime is 21221123233. The reversal of 21221123202 is 20232112212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2020452 + ... + 2030927.

It is an arithmetic number, because the mean of its divisors is an integer number (1488882150).

Almost surely, 2^21221123202 is an apocalyptic number.

21221123202 is an abundant number, since it is smaller than the sum of its proper divisors (26423105598).

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

21221123202 is a wasteful number, since it uses less digits than its factorization.

21221123202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4051487 (or 4051481 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21221123202 its reverse (20232112212), we get a palindrome (41453235414).

The spelling of 21221123202 in words is "twenty-one billion, two hundred twenty-one million, one hundred twenty-three thousand, two hundred two".