21001211292 has 12 divisors (see below), whose sum is σ = 49002826376. Its totient is φ = 7000403760.

The previous prime is 21001211291. The next prime is 21001211311. The reversal of 21001211292 is 29211210012.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001211291) 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 3 ways as a sum of consecutive naturals, for example, 875050459 + ... + 875050482.

Almost surely, 2^21001211292 is an apocalyptic number.

It is an amenable number.

21001211292 is an abundant number, since it is smaller than the sum of its proper divisors (28001615084).

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

21001211292 is a wasteful number, since it uses less digits than its factorization.

21001211292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750100948 (or 1750100946 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 21001211292 in words is "twenty-one billion, one million, two hundred eleven thousand, two hundred ninety-two".