100121021 has 32 divisors (see below), whose sum is σ = 139104000. Its totient is φ = 69511680.

The previous prime is 100121011. The next prime is 100121023. The reversal of 100121021 is 120121001.

It is not a de Polignac number, because 100121021 - 2¹⁰ = 100119997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100121023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27305 + ... + 30753.

It is an arithmetic number, because the mean of its divisors is an integer number (4347000).

Almost surely, 2^100121021 is an apocalyptic number.

100121021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100121021 is a deficient number, since it is larger than the sum of its proper divisors (38982979).

100121021 is a wasteful number, since it uses less digits than its factorization.

100121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3509.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 100121021 is about 10006.0492203467. The cubic root of 100121021 is about 464.3460511182.

Adding to 100121021 its reverse (120121001), we get a palindrome (220242022).

It can be divided in two parts, 1001 and 21021, that added together give a palindrome (22022).

The spelling of 100121021 in words is "one hundred million, one hundred twenty-one thousand, twenty-one".