121351221642 has 64 divisors (see below), whose sum is σ = 283539087360. Its totient is φ = 33902541696.

The previous prime is 121351221617. The next prime is 121351221643. The reversal of 121351221642 is 246122153121.

It is a super-2 number, since 2×121351221642² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121351221643) 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, 2137459 + ... + 2193497.

It is an arithmetic number, because the mean of its divisors is an integer number (4430298240).

Almost surely, 2^121351221642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121351221642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141769543680).

121351221642 is an abundant number, since it is smaller than the sum of its proper divisors (162187865718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121351221642 is a wasteful number, since it uses less digits than its factorization.

121351221642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57195.

The product of its digits is 5760, while the sum is 30.

Adding to 121351221642 its reverse (246122153121), we get a palindrome (367473374763).

The spelling of 121351221642 in words is "one hundred twenty-one billion, three hundred fifty-one million, two hundred twenty-one thousand, six hundred forty-two".