21121201096 has 8 divisors (see below), whose sum is σ = 39602252070. Its totient is φ = 10560600544.

The previous prime is 21121201009. The next prime is 21121201099. The reversal of 21121201096 is 69010212112.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20481616996 + 639584100 = 143114^2 + 25290^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21121201096² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21121201096.

It is not an unprimeable number, because it can be changed into a prime (21121201099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320075061 + ... + 1320075076.

Almost surely, 2^21121201096 is an apocalyptic number.

It is an amenable number.

21121201096 is a deficient number, since it is larger than the sum of its proper divisors (18481050974).

21121201096 is a wasteful number, since it uses less digits than its factorization.

21121201096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2640150143 (or 2640150139 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 25.

The spelling of 21121201096 in words is "twenty-one billion, one hundred twenty-one million, two hundred one thousand, ninety-six".