102021211112121 has 56 divisors (see below), whose sum is σ = 174869574493824. Its totient is φ = 58279146606720.

The previous prime is 102021211112083. The next prime is 102021211112167. The reversal of 102021211112121 is 121211112120201.

It is a happy number.

It is not a de Polignac number, because 102021211112121 - 2⁹ = 102021211111609 is a prime.

It is a super-2 number, since 2×102021211112121² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 102021211112094 and 102021211112103.

It is not an unprimeable number, because it can be changed into a prime (102021211111121) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 12723580 + ... + 19129346.

It is an arithmetic number, because the mean of its divisors is an integer number (3122670973104).

Almost surely, 2^{102021211112121} is an apocalyptic number.

It is an amenable number.

102021211112121 is a deficient number, since it is larger than the sum of its proper divisors (72848363381703).

102021211112121 is an frugal number, since it uses more digits than its factorization.

102021211112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6408913 (or 6408898 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 102021211112121 its reverse (121211112120201), we get a palindrome (223232323232322).

The spelling of 102021211112121 in words is "one hundred two trillion, twenty-one billion, two hundred eleven million, one hundred twelve thousand, one hundred twenty-one".