121420312144 has 20 divisors (see below), whose sum is σ = 235447772020. Its totient is φ = 60659596800.

The previous prime is 121420312133. The next prime is 121420312147. The reversal of 121420312144 is 441213024121.

It can be written as a sum of positive squares in 2 ways, for example, as 9471182400 + 111949129744 = 97320^2 + 334588^2 .

It is a super-2 number, since 2×121420312144² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121420312147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3140139 + ... + 3178570.

It is an arithmetic number, because the mean of its divisors is an integer number (11772388601).

Almost surely, 2^121420312144 is an apocalyptic number.

It is an amenable number.

121420312144 is a deficient number, since it is larger than the sum of its proper divisors (114027459876).

121420312144 is a wasteful number, since it uses less digits than its factorization.

121420312144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6319918 (or 6319912 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 121420312144 its reverse (441213024121), we get a palindrome (562633336265).

The spelling of 121420312144 in words is "one hundred twenty-one billion, four hundred twenty million, three hundred twelve thousand, one hundred forty-four".