21249736397097 has 16 divisors (see below), whose sum is σ = 30604624628928. Its totient is φ = 13037254021440.

The previous prime is 21249736397089. The next prime is 21249736397117. The reversal of 21249736397097 is 79079363794212.

It is a happy number.

It is not a de Polignac number, because 21249736397097 - 2³ = 21249736397089 is a prime.

It is a super-2 number, since 2×21249736397097² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21249736397027) 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, 823046058 + ... + 823071875.

It is an arithmetic number, because the mean of its divisors is an integer number (1912789039308).

Almost surely, 2^{21249736397097} is an apocalyptic number.

It is an amenable number.

21249736397097 is a deficient number, since it is larger than the sum of its proper divisors (9354888231831).

21249736397097 is a wasteful number, since it uses less digits than its factorization.

21249736397097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646118280.

The product of its (nonzero) digits is 216040608, while the sum is 69.

The spelling of 21249736397097 in words is "twenty-one trillion, two hundred forty-nine billion, seven hundred thirty-six million, three hundred ninety-seven thousand, ninety-seven".