100400033120021 has 4 divisors (see below), whose sum is σ = 101374790723232. Its totient is φ = 99425275516812.

The previous prime is 100400033120003. The next prime is 100400033120059. The reversal of 100400033120021 is 120021330004001.

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 100400033120021 - 2³⁸ = 100125155213077 is a prime.

It is a super-3 number, since 3×100400033120021³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100400033110021) 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, 487378801451 + ... + 487378801656.

It is an arithmetic number, because the mean of its divisors is an integer number (25343697680808).

Almost surely, 2^{100400033120021} is an apocalyptic number.

It is an amenable number.

100400033120021 is a deficient number, since it is larger than the sum of its proper divisors (974757603211).

100400033120021 is an equidigital number, since it uses as much as digits as its factorization.

100400033120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974757603210.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 100400033120021 its reverse (120021330004001), we get a palindrome (220421363124022).

The spelling of 100400033120021 in words is "one hundred trillion, four hundred billion, thirty-three million, one hundred twenty thousand, twenty-one".