21011101020982 has 8 divisors (see below), whose sum is σ = 31516672524552. Its totient is φ = 10505543512800.

The previous prime is 21011101020941. The next prime is 21011101021037. The reversal of 21011101020982 is 28902010111012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21011101020982² (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 21011101020982.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1953982 + ... + 6770542.

It is an arithmetic number, because the mean of its divisors is an integer number (3939584065569).

Almost surely, 2^{21011101020982} is an apocalyptic number.

21011101020982 is a deficient number, since it is larger than the sum of its proper divisors (10505571503570).

21011101020982 is a wasteful number, since it uses less digits than its factorization.

21011101020982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6997694.

The product of its (nonzero) digits is 576, while the sum is 28.

Adding to 21011101020982 its reverse (28902010111012), we get a palindrome (49913111131994).

The spelling of 21011101020982 in words is "twenty-one trillion, eleven billion, one hundred one million, twenty thousand, nine hundred eighty-two".