21101210220004 has 12 divisors (see below), whose sum is σ = 36929155145344. Its totient is φ = 10550023035624.

The previous prime is 21101210219927. The next prime is 21101210220061. The reversal of 21101210220004 is 40002201210112.

It is a super-2 number, since 2×21101210220004² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21101210220004.

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, 145437024 + ... + 145582039.

Almost surely, 2^{21101210220004} is an apocalyptic number.

It is an amenable number.

21101210220004 is a deficient number, since it is larger than the sum of its proper divisors (15827944925340).

21101210220004 is a wasteful number, since it uses less digits than its factorization.

21101210220004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291037194 (or 291037192 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21101210220004 its reverse (40002201210112), we get a palindrome (61103411430116).

The spelling of 21101210220004 in words is "twenty-one trillion, one hundred one billion, two hundred ten million, two hundred twenty thousand, four".