121100210000021 has 8 divisors (see below), whose sum is σ = 145684463158080. Its totient is φ = 98337012631488.

The previous prime is 121100209999969. The next prime is 121100210000023. The reversal of 121100210000021 is 120000012001121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121100210000021 - 2¹⁸ = 121100209737877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121100209999957 and 121100210000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121100210000023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 455263947236 + ... + 455263947501.

It is an arithmetic number, because the mean of its divisors is an integer number (18210557894760).

Almost surely, 2^{121100210000021} is an apocalyptic number.

It is an amenable number.

121100210000021 is a deficient number, since it is larger than the sum of its proper divisors (24584253158059).

121100210000021 is an equidigital number, since it uses as much as digits as its factorization.

121100210000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910527894763.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 121100210000021 its reverse (120000012001121), we get a palindrome (241100222001142).

The spelling of 121100210000021 in words is "one hundred twenty-one trillion, one hundred billion, two hundred ten million, twenty-one", and thus it is an aban number.