121021101000 has 512 divisors, whose sum is σ = 446161996800. Its totient is φ = 30278476800.

The previous prime is 121021100969. The next prime is 121021101007. The reversal of 121021101000 is 101120121.

It is a happy number.

It is a super-2 number, since 2×121021101000² (a number of 23 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (121021101007) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 32911162 + ... + 32914838.

It is an arithmetic number, because the mean of its divisors is an integer number (871410150).

Almost surely, 2^121021101000 is an apocalyptic number.

121021101000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121021101000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223080998400).

121021101000 is an abundant number, since it is smaller than the sum of its proper divisors (325140895800).

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

121021101000 is a wasteful number, since it uses less digits than its factorization.

121021101000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3783 (or 3763 counting only the distinct ones).

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

Adding to 121021101000 its reverse (101120121), we get a palindrome (121122221121).

The spelling of 121021101000 in words is "one hundred twenty-one billion, twenty-one million, one hundred one thousand".