102121121211 has 16 divisors (see below), whose sum is σ = 142816894464. Its totient is φ = 64831346784.

The previous prime is 102121121191. The next prime is 102121121231. The reversal of 102121121211 is 112121121201.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (102121121191) and next prime (102121121231).

It is not a de Polignac number, because 102121121211 - 2⁷ = 102121121083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (102121121231) 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, 9782125 + ... + 9792558.

It is an arithmetic number, because the mean of its divisors is an integer number (8926055904).

Almost surely, 2^102121121211 is an apocalyptic number.

102121121211 is a deficient number, since it is larger than the sum of its proper divisors (40695773253).

102121121211 is a wasteful number, since it uses less digits than its factorization.

102121121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19574770.

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

Adding to 102121121211 its reverse (112121121201), we get a palindrome (214242242412).

The spelling of 102121121211 in words is "one hundred two billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred eleven".