21012021211120 has 80 divisors (see below), whose sum is σ = 49579233029568. Its totient is φ = 8280039075840.

The previous prime is 21012021211117. The next prime is 21012021211151. The reversal of 21012021211120 is 2111212021012.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×21012021211120² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 21012021211094 and 21012021211103.

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, 5940862 + ... + 8793058.

Almost surely, 2^{21012021211120} is an apocalyptic number.

21012021211120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21012021211120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24789616514784).

21012021211120 is an abundant number, since it is smaller than the sum of its proper divisors (28567211818448).

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

21012021211120 is a wasteful number, since it uses less digits than its factorization.

21012021211120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2853578 (or 2853572 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21012021211120 its reverse (2111212021012), we get a palindrome (23123233232132).

The spelling of 21012021211120 in words is "twenty-one trillion, twelve billion, twenty-one million, two hundred eleven thousand, one hundred twenty".