21211210097 has 24 divisors (see below), whose sum is σ = 28212887808. Its totient is φ = 15555957120.

The previous prime is 21211210079. The next prime is 21211210103. The reversal of 21211210097 is 79001211212.

It is not a de Polignac number, because 21211210097 - 2¹⁰ = 21211209073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21211210037) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 722153 + ... + 750950.

It is an arithmetic number, because the mean of its divisors is an integer number (1175536992).

Almost surely, 2^21211210097 is an apocalyptic number.

It is an amenable number.

21211210097 is a deficient number, since it is larger than the sum of its proper divisors (7001677711).

21211210097 is a wasteful number, since it uses less digits than its factorization.

21211210097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473149 (or 1473138 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 26.

The spelling of 21211210097 in words is "twenty-one billion, two hundred eleven million, two hundred ten thousand, ninety-seven".