1121221100021 has 4 divisors (see below), whose sum is σ = 1223150290944. Its totient is φ = 1019291909100.

The previous prime is 1121221099987. The next prime is 1121221100057. The reversal of 1121221100021 is 1200011221211.

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 1121221100021 - 2²² = 1121216905717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121221099969 and 1121221100005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121221100221) 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, 50964595445 + ... + 50964595466.

It is an arithmetic number, because the mean of its divisors is an integer number (305787572736).

Almost surely, 2^{1121221100021} is an apocalyptic number.

1121221100021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1121221100021 is a deficient number, since it is larger than the sum of its proper divisors (101929190923).

1121221100021 is a wasteful number, since it uses less digits than its factorization.

1121221100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101929190922.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1121221100021 its reverse (1200011221211), we get a palindrome (2321232321232).

The spelling of 1121221100021 in words is "one trillion, one hundred twenty-one billion, two hundred twenty-one million, one hundred thousand, twenty-one".