121211101000 has 64 divisors (see below), whose sum is σ = 309418911360. Its totient is φ = 44076760000.

The previous prime is 121211100991. The next prime is 121211101009. The reversal of 121211101000 is 101112121.

It is an interprime number because it is at equal distance from previous prime (121211100991) and next prime (121211101009).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (121211101009) 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, 5498596 + ... + 5520595.

It is an arithmetic number, because the mean of its divisors is an integer number (4834670490).

Almost surely, 2^121211101000 is an apocalyptic number.

121211101000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121211101000 is an abundant number, since it is smaller than the sum of its proper divisors (188207810360).

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

121211101000 is a wasteful number, since it uses less digits than its factorization.

121211101000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11019223 (or 11019209 counting only the distinct ones).

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

Adding to 121211101000 its reverse (101112121), we get a palindrome (121312213121).

The spelling of 121211101000 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred one thousand".