102121001021 has 16 divisors (see below), whose sum is σ = 111620463360. Its totient is φ = 92861795520.

The previous prime is 102121001011. The next prime is 102121001083. The reversal of 102121001021 is 120100121201.

It is not a de Polignac number, because 102121001021 - 2¹⁸ = 102120738877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102121000993 and 102121001011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102121001011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 342731 + ... + 567191.

It is an arithmetic number, because the mean of its divisors is an integer number (6976278960).

Almost surely, 2^102121001021 is an apocalyptic number.

It is an amenable number.

102121001021 is a deficient number, since it is larger than the sum of its proper divisors (9499462339).

102121001021 is a wasteful number, since it uses less digits than its factorization.

102121001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224996.

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

Adding to 102121001021 its reverse (120100121201), we get a palindrome (222221122222).

The spelling of 102121001021 in words is "one hundred two billion, one hundred twenty-one million, one thousand, twenty-one".