211221000297 has 16 divisors (see below), whose sum is σ = 313057759680. Its totient is φ = 140752008576.

The previous prime is 211221000293. The next prime is 211221000311. The reversal of 211221000297 is 792000122112.

It is not a de Polignac number, because 211221000297 - 2² = 211221000293 is a prime.

It is a super-2 number, since 2×211221000297² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 211221000297.

It is not an unprimeable number, because it can be changed into a prime (211221000293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1659483 + ... + 1782224.

It is an arithmetic number, because the mean of its divisors is an integer number (19566109980).

Almost surely, 2^211221000297 is an apocalyptic number.

211221000297 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

211221000297 is a deficient number, since it is larger than the sum of its proper divisors (101836759383).

211221000297 is a wasteful number, since it uses less digits than its factorization.

211221000297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3443989 (or 3443983 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The spelling of 211221000297 in words is "two hundred eleven billion, two hundred twenty-one million, two hundred ninety-seven", and thus it is an aban number.