21001211120110 has 32 divisors (see below), whose sum is σ = 41377417738272. Its totient is φ = 7627173770880.

The previous prime is 21001211120089. The next prime is 21001211120137. The reversal of 21001211120110 is 1102111210012.

It is a happy number.

It is a super-2 number, since 2×21001211120110² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1324154184 + ... + 1324170043.

It is an arithmetic number, because the mean of its divisors is an integer number (1293044304321).

Almost surely, 2^{21001211120110} is an apocalyptic number.

21001211120110 is a deficient number, since it is larger than the sum of its proper divisors (20376206618162).

21001211120110 is a wasteful number, since it uses less digits than its factorization.

21001211120110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2648324308.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21001211120110 its reverse (1102111210012), we get a palindrome (22103322330122).

The spelling of 21001211120110 in words is "twenty-one trillion, one billion, two hundred eleven million, one hundred twenty thousand, one hundred ten".