121211021221012 has 6 divisors (see below), whose sum is σ = 212119287136778. Its totient is φ = 60605510610504.

The previous prime is 121211021220997. The next prime is 121211021221013. The reversal of 121211021221012 is 210122120112121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 95736127146256 + 25474894074756 = 9784484^2 + 5047266^2 .

It is a super-2 number, since 2×121211021221012² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211021221013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15151377652623 + ... + 15151377652630.

Almost surely, 2^{121211021221012} is an apocalyptic number.

It is an amenable number.

121211021221012 is a deficient number, since it is larger than the sum of its proper divisors (90908265915766).

121211021221012 is a wasteful number, since it uses less digits than its factorization.

121211021221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30302755305257 (or 30302755305255 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121211021221012 its reverse (210122120112121), we get a palindrome (331333141333133).

The spelling of 121211021221012 in words is "one hundred twenty-one trillion, two hundred eleven billion, twenty-one million, two hundred twenty-one thousand, twelve".