21828770097 has 4 divisors (see below), whose sum is σ = 29105026800. Its totient is φ = 14552513396.

The previous prime is 21828770077. The next prime is 21828770101. The reversal of 21828770097 is 79007782812.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21828770097 - 2¹⁰ = 21828769073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21828770017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3638128347 + ... + 3638128352.

It is an arithmetic number, because the mean of its divisors is an integer number (7276256700).

Almost surely, 2^21828770097 is an apocalyptic number.

It is an amenable number.

21828770097 is a deficient number, since it is larger than the sum of its proper divisors (7276256703).

21828770097 is an equidigital number, since it uses as much as digits as its factorization.

21828770097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7276256702.

The product of its (nonzero) digits is 790272, while the sum is 51.

The spelling of 21828770097 in words is "twenty-one billion, eight hundred twenty-eight million, seven hundred seventy thousand, ninety-seven".