121222043421 has 16 divisors (see below), whose sum is σ = 168718550400. Its totient is φ = 77272690880.

The previous prime is 121222043399. The next prime is 121222043441. The reversal of 121222043421 is 124340222121.

It is a cyclic number.

It is not a de Polignac number, because 121222043421 - 2¹⁰ = 121222042397 is a prime.

It is a super-2 number, since 2×121222043421² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121222043391 and 121222043400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121222043441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131346 + ... + 509603.

It is an arithmetic number, because the mean of its divisors is an integer number (10544909400).

Almost surely, 2^121222043421 is an apocalyptic number.

It is an amenable number.

121222043421 is a deficient number, since it is larger than the sum of its proper divisors (47496506979).

121222043421 is a wasteful number, since it uses less digits than its factorization.

121222043421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643716.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 121222043421 its reverse (124340222121), we get a palindrome (245562265542).

The spelling of 121222043421 in words is "one hundred twenty-one billion, two hundred twenty-two million, forty-three thousand, four hundred twenty-one".