121021001010 has 192 divisors, whose sum is σ = 388198137600. Its totient is φ = 25472724480.

The previous prime is 121021001009. The next prime is 121021001063. The reversal of 121021001010 is 10100120121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121021000983 and 121021001001.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3430441 + ... + 3465539.

It is an arithmetic number, because the mean of its divisors is an integer number (2021865300).

Almost surely, 2^121021001010 is an apocalyptic number.

121021001010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121021001010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194099068800).

121021001010 is an abundant number, since it is smaller than the sum of its proper divisors (267177136590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121021001010 is a wasteful number, since it uses less digits than its factorization.

121021001010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35553 (or 35550 counting only the distinct ones).

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

Adding to 121021001010 its reverse (10100120121), we get a palindrome (131121121131).

The spelling of 121021001010 in words is "one hundred twenty-one billion, twenty-one million, one thousand, ten".