121233210021 has 48 divisors (see below), whose sum is σ = 222444144000. Its totient is φ = 61790002560.

The previous prime is 121233210019. The next prime is 121233210023. The reversal of 121233210021 is 120012332121.

121233210021 is a `hidden beast` number, since 1 + 212 + 332 + 100 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (121233210019) and next prime (121233210023).

It is not a de Polignac number, because 121233210021 - 2¹ = 121233210019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121233209976 and 121233210003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121233210023) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1613646 + ... + 1687103.

It is an arithmetic number, because the mean of its divisors is an integer number (4634253000).

Almost surely, 2^121233210021 is an apocalyptic number.

121233210021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121233210021 is a deficient number, since it is larger than the sum of its proper divisors (101210933979).

121233210021 is a wasteful number, since it uses less digits than its factorization.

121233210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3300826 (or 3300823 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 121233210021 its reverse (120012332121), we get a palindrome (241245542142).

It can be divided in two parts, 1212332100 and 21, that added together give a palindrome (1212332121).

The spelling of 121233210021 in words is "one hundred twenty-one billion, two hundred thirty-three million, two hundred ten thousand, twenty-one".