1221212021011 has 2 divisors, whose sum is σ = 1221212021012. Its totient is φ = 1221212021010.

The previous prime is 1221212020999. The next prime is 1221212021023. The reversal of 1221212021011 is 1101202121221.

It is a balanced prime because it is at equal distance from previous prime (1221212020999) and next prime (1221212021023).

It is a cyclic number.

It is not a de Polignac number, because 1221212021011 - 2⁹ = 1221212020499 is a prime.

It is a super-2 number, since 2×1221212021011² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221212021311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610606010505 + 610606010506.

It is an arithmetic number, because the mean of its divisors is an integer number (610606010506).

Almost surely, 2^{1221212021011} is an apocalyptic number.

1221212021011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221212021011 is an equidigital number, since it uses as much as digits as its factorization.

1221212021011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221212021011 its reverse (1101202121221), we get a palindrome (2322414142232).

The spelling of 1221212021011 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, twenty-one thousand, eleven".