21011029110 has 48 divisors (see below), whose sum is σ = 54649664784. Its totient is φ = 5600788416.

The previous prime is 21011029073. The next prime is 21011029157. The reversal of 21011029110 is 1192011012.

It is a happy number.

It is a super-2 number, since 2×21011029110² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 197964 + ... + 284976.

It is an arithmetic number, because the mean of its divisors is an integer number (1138534683).

Almost surely, 2^21011029110 is an apocalyptic number.

21011029110 is an abundant number, since it is smaller than the sum of its proper divisors (33638635674).

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

21011029110 is a wasteful number, since it uses less digits than its factorization.

21011029110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89709 (or 89706 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

The spelling of 21011029110 in words is "twenty-one billion, eleven million, twenty-nine thousand, one hundred ten".