21111021010988 has 12 divisors (see below), whose sum is σ = 37039259231520. Its totient is φ = 10528375516272.

The previous prime is 21111021010987. The next prime is 21111021011039. The reversal of 21111021010988 is 88901012011112.

It is a super-2 number, since 2×21111021010988² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21111021010987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6783745556 + ... + 6783748667.

It is an arithmetic number, because the mean of its divisors is an integer number (3086604935960).

Almost surely, 2^{21111021010988} is an apocalyptic number.

It is an amenable number.

21111021010988 is a deficient number, since it is larger than the sum of its proper divisors (15928238220532).

21111021010988 is a wasteful number, since it uses less digits than its factorization.

21111021010988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13567494616 (or 13567494614 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 35.

The spelling of 21111021010988 in words is "twenty-one trillion, one hundred eleven billion, twenty-one million, ten thousand, nine hundred eighty-eight".