21110001211320 has 64 divisors (see below), whose sum is σ = 72377147013120. Its totient is φ = 4825143133824.

The previous prime is 21110001211309. The next prime is 21110001211331. The reversal of 21110001211320 is 2311210001112.

It is an interprime number because it is at equal distance from previous prime (21110001211309) and next prime (21110001211331).

It is a super-2 number, since 2×21110001211320² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21110001211320.

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, 12565476072 + ... + 12565477751.

It is an arithmetic number, because the mean of its divisors is an integer number (1130892922080).

Almost surely, 2^{21110001211320} is an apocalyptic number.

21110001211320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110001211320 is an abundant number, since it is smaller than the sum of its proper divisors (51267145801800).

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

21110001211320 is a wasteful number, since it uses less digits than its factorization.

21110001211320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25130953844 (or 25130953840 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21110001211320 its reverse (2311210001112), we get a palindrome (23421211212432).

The spelling of 21110001211320 in words is "twenty-one trillion, one hundred ten billion, one million, two hundred eleven thousand, three hundred twenty".