121221201011 has 16 divisors (see below), whose sum is σ = 129701150208. Its totient is φ = 112892544000.

The previous prime is 121221201001. The next prime is 121221201029. The reversal of 121221201011 is 110102122121.

It is a cyclic number.

It is not a de Polignac number, because 121221201011 - 2¹⁰ = 121221199987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121221201001) 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, 2934446 + ... + 2975468.

It is an arithmetic number, because the mean of its divisors is an integer number (8106321888).

Almost surely, 2^121221201011 is an apocalyptic number.

121221201011 is a deficient number, since it is larger than the sum of its proper divisors (8479949197).

121221201011 is a wasteful number, since it uses less digits than its factorization.

121221201011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42862.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121221201011 its reverse (110102122121), we get a palindrome (231323323132).

The spelling of 121221201011 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred one thousand, eleven".