21001201092 has 36 divisors (see below), whose sum is σ = 54916936620. Its totient is φ = 6759006912.

The previous prime is 21001200991. The next prime is 21001201127. The reversal of 21001201092 is 29010210012.

It can be written as a sum of positive squares in 2 ways, for example, as 7481558016 + 13519643076 = 86496^2 + 116274^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 10057003 + ... + 10059090.

Almost surely, 2^21001201092 is an apocalyptic number.

It is an amenable number.

21001201092 is an abundant number, since it is smaller than the sum of its proper divisors (33915735528).

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

21001201092 is a wasteful number, since it uses less digits than its factorization.

21001201092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20116132 (or 20116127 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The spelling of 21001201092 in words is "twenty-one billion, one million, two hundred one thousand, ninety-two".