102121100121021 has 8 divisors (see below), whose sum is σ = 136241140016160. Its totient is φ = 68040896819952.

The previous prime is 102121100121011. The next prime is 102121100121059. The reversal of 102121100121021 is 120121001121201.

It is a happy number.

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

It is not a de Polignac number, because 102121100121021 - 2⁵ = 102121100120989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102121100121011) 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, 9959142535 + ... + 9959152788.

It is an arithmetic number, because the mean of its divisors is an integer number (17030142502020).

Almost surely, 2^{102121100121021} is an apocalyptic number.

It is an amenable number.

102121100121021 is a deficient number, since it is larger than the sum of its proper divisors (34120039895139).

102121100121021 is a wasteful number, since it uses less digits than its factorization.

102121100121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19918297035.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 102121100121021 its reverse (120121001121201), we get a palindrome (222242101242222).

The spelling of 102121100121021 in words is "one hundred two trillion, one hundred twenty-one billion, one hundred million, one hundred twenty-one thousand, twenty-one".