121021202109 has 8 divisors (see below), whose sum is σ = 161764002432. Its totient is φ = 80479601600.

The previous prime is 121021202089. The next prime is 121021202153. The reversal of 121021202109 is 901202120121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121021202109 - 2⁷ = 121021201981 is a prime.

It is a super-2 number, since 2×121021202109² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021202179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50298549 + ... + 50300954.

It is an arithmetic number, because the mean of its divisors is an integer number (20220500304).

Almost surely, 2^121021202109 is an apocalyptic number.

It is an amenable number.

121021202109 is a deficient number, since it is larger than the sum of its proper divisors (40742800323).

121021202109 is a wasteful number, since it uses less digits than its factorization.

121021202109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100599907.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 121021202109 in words is "one hundred twenty-one billion, twenty-one million, two hundred two thousand, one hundred nine".