121331000021 has 8 divisors (see below), whose sum is σ = 151269818304. Its totient is φ = 94543636320.

The previous prime is 121330999981. The next prime is 121331000047. The reversal of 121331000021 is 120000133121.

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

It is not a de Polignac number, because 121331000021 - 2³⁰ = 120257258197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121331000051) 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, 787863560 + ... + 787863713.

It is an arithmetic number, because the mean of its divisors is an integer number (18908727288).

Almost surely, 2^121331000021 is an apocalyptic number.

121331000021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121331000021 is a deficient number, since it is larger than the sum of its proper divisors (29938818283).

121331000021 is a wasteful number, since it uses less digits than its factorization.

121331000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1575727291.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 121331000021 its reverse (120000133121), we get a palindrome (241331133142).

The spelling of 121331000021 in words is "one hundred twenty-one billion, three hundred thirty-one million, twenty-one", and thus it is an aban number.