102121011 has 6 divisors (see below), whose sum is σ = 147508140. Its totient is φ = 68080668.

The previous prime is 102121007. The next prime is 102121013. The reversal of 102121011 is 110121201.

It is a happy number.

It is not a de Polignac number, because 102121011 - 2² = 102121007 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 11346779 = 102121011 / (1 + 0 + 2 + 1 + 2 + 1 + 0 + 1 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 102120984 and 102121002.

It is not an unprimeable number, because it can be changed into a prime (102121013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5673381 + ... + 5673398.

It is an arithmetic number, because the mean of its divisors is an integer number (24584690).

Almost surely, 2^102121011 is an apocalyptic number.

102121011 is a deficient number, since it is larger than the sum of its proper divisors (45387129).

102121011 is a wasteful number, since it uses less digits than its factorization.

102121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11346785 (or 11346782 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 102121011 is about 10105.4940997459. The cubic root of 102121011 is about 467.4175720918.

Adding to 102121011 its reverse (110121201), we get a palindrome (212242212).

The spelling of 102121011 in words is "one hundred two million, one hundred twenty-one thousand, eleven".