121211001021 has 32 divisors (see below), whose sum is σ = 183796310016. Its totient is φ = 70387560000.

The previous prime is 121211000971. The next prime is 121211001031. The reversal of 121211001021 is 120100112121.

It is not a de Polignac number, because 121211001021 - 2⁹ = 121211000509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121211000988 and 121211001006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211001031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 483241 + ... + 689886.

It is an arithmetic number, because the mean of its divisors is an integer number (5743634688).

Almost surely, 2^121211001021 is an apocalyptic number.

121211001021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121211001021 is a deficient number, since it is larger than the sum of its proper divisors (62585308995).

121211001021 is a wasteful number, since it uses less digits than its factorization.

121211001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173273.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 121211001021 its reverse (120100112121), we get a palindrome (241311113142).

Subtracting from 121211001021 its reverse (120100112121), we obtain a square (1110888900 = 33330²).

It can be divided in two parts, 12121100 and 1021, that added together give a palindrome (12122121).

The spelling of 121211001021 in words is "one hundred twenty-one billion, two hundred eleven million, one thousand, twenty-one".