21012011097 has 24 divisors (see below), whose sum is σ = 35552793312. Its totient is φ = 10915329600.

The previous prime is 21012011093. The next prime is 21012011143. The reversal of 21012011097 is 79011021012.

It is not a de Polignac number, because 21012011097 - 2² = 21012011093 is a prime.

It is a super-2 number, since 2×21012011097² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21012011093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6495604 + ... + 6498837.

It is an arithmetic number, because the mean of its divisors is an integer number (1481366388).

Almost surely, 2^21012011097 is an apocalyptic number.

It is an amenable number.

21012011097 is a deficient number, since it is larger than the sum of its proper divisors (14540782215).

21012011097 is a wasteful number, since it uses less digits than its factorization.

21012011097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12994469 (or 12994462 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 24.

The spelling of 21012011097 in words is "twenty-one billion, twelve million, eleven thousand, ninety-seven".