1210121101 has 12 divisors (see below), whose sum is σ = 1420854048. Its totient is φ = 1027548312.

The previous prime is 1210121063. The next prime is 1210121113. The reversal of 1210121101 is 1011210121.

It is not a de Polignac number, because 1210121101 - 2²⁷ = 1075903373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210121201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110161 + ... + 120646.

It is an arithmetic number, because the mean of its divisors is an integer number (118404504).

Almost surely, 2^1210121101 is an apocalyptic number.

It is an amenable number.

1210121101 is a deficient number, since it is larger than the sum of its proper divisors (210732947).

1210121101 is a wasteful number, since it uses less digits than its factorization.

1210121101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230928 (or 230921 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1210121101 is about 34786.7949227864. The cubic root of 1210121101 is about 1065.6377853042.

Adding to 1210121101 its reverse (1011210121), we get a palindrome (2221331222).

It can be divided in two parts, 1210121 and 101, that multiplied together give a palindrome (122222221).

The spelling of 1210121101 in words is "one billion, two hundred ten million, one hundred twenty-one thousand, one hundred one".