1212100121001 has 32 divisors (see below), whose sum is σ = 2061778295808. Its totient is φ = 615019083840.

The previous prime is 1212100120999. The next prime is 1212100121021. The reversal of 1212100121001 is 1001210012121.

It is not a de Polignac number, because 1212100121001 - 2¹ = 1212100120999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212100121021) 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, 61003866 + ... + 61023731.

It is an arithmetic number, because the mean of its divisors is an integer number (64430571744).

Almost surely, 2^{1212100121001} is an apocalyptic number.

1212100121001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212100121001 is a deficient number, since it is larger than the sum of its proper divisors (849678174807).

1212100121001 is a wasteful number, since it uses less digits than its factorization.

1212100121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122027661.

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

Adding to 1212100121001 its reverse (1001210012121), we get a palindrome (2213310133122).

The spelling of 1212100121001 in words is "one trillion, two hundred twelve billion, one hundred million, one hundred twenty-one thousand, one".