102121031221 has 16 divisors (see below), whose sum is σ = 111827041920. Its totient is φ = 92486047680.

The previous prime is 102121031179. The next prime is 102121031359. The reversal of 102121031221 is 122130121201.

It is a cyclic number.

It is not a de Polignac number, because 102121031221 - 2¹¹ = 102121029173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102121031195 and 102121031204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102121031921) 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, 3253615 + ... + 3284851.

It is an arithmetic number, because the mean of its divisors is an integer number (6989190120).

Almost surely, 2^102121031221 is an apocalyptic number.

102121031221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

102121031221 is a deficient number, since it is larger than the sum of its proper divisors (9706010699).

102121031221 is a wasteful number, since it uses less digits than its factorization.

102121031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32364.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 102121031221 its reverse (122130121201), we get a palindrome (224251152422).

The spelling of 102121031221 in words is "one hundred two billion, one hundred twenty-one million, thirty-one thousand, two hundred twenty-one".