21291202212 has 48 divisors (see below), whose sum is σ = 59245089792. Its totient is φ = 5818713120.

The previous prime is 21291202211. The next prime is 21291202213. The reversal of 21291202212 is 21220219212.

It is an interprime number because it is at equal distance from previous prime (21291202211) and next prime (21291202213).

It is not an unprimeable number, because it can be changed into a prime (21291202211) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 5508214 + ... + 5512077.

It is an arithmetic number, because the mean of its divisors is an integer number (1234272704).

Almost surely, 2^21291202212 is an apocalyptic number.

It is an amenable number.

21291202212 is an abundant number, since it is smaller than the sum of its proper divisors (37953887580).

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

21291202212 is a wasteful number, since it uses less digits than its factorization.

21291202212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11020328 (or 11020326 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The spelling of 21291202212 in words is "twenty-one billion, two hundred ninety-one million, two hundred two thousand, two hundred twelve".