1212211220001 has 32 divisors (see below), whose sum is σ = 1713474072576. Its totient is φ = 759662880000.

The previous prime is 1212211219981. The next prime is 1212211220029. The reversal of 1212211220001 is 1000221122121.

It is not a de Polignac number, because 1212211220001 - 2¹⁵ = 1212211187233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212211220041) 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, 181167066 + ... + 181173756.

It is an arithmetic number, because the mean of its divisors is an integer number (53546064768).

Almost surely, 2^{1212211220001} is an apocalyptic number.

It is an amenable number.

1212211220001 is a deficient number, since it is larger than the sum of its proper divisors (501262852575).

1212211220001 is a wasteful number, since it uses less digits than its factorization.

1212211220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10573.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1212211220001 its reverse (1000221122121), we get a palindrome (2212432342122).

The spelling of 1212211220001 in words is "one trillion, two hundred twelve billion, two hundred eleven million, two hundred twenty thousand, one".