21980220022 has 4 divisors (see below), whose sum is σ = 32970330036. Its totient is φ = 10990110010.

The previous prime is 21980220013. The next prime is 21980220047. The reversal of 21980220022 is 22002208912.

It is a semiprime because it is the product of two primes.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 5495055004 + ... + 5495055007.

It is an arithmetic number, because the mean of its divisors is an integer number (8242582509).

Almost surely, 2^21980220022 is an apocalyptic number.

21980220022 is a deficient number, since it is larger than the sum of its proper divisors (10990110014).

21980220022 is a wasteful number, since it uses less digits than its factorization.

21980220022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10990110013.

The product of its (nonzero) digits is 2304, while the sum is 28.

Adding to 21980220022 its reverse (22002208912), we get a palindrome (43982428934).

The spelling of 21980220022 in words is "twenty-one billion, nine hundred eighty million, two hundred twenty thousand, twenty-two".