221202121424 has 40 divisors (see below), whose sum is σ = 444303205632. Its totient is φ = 106573858560.

The previous prime is 221202121373. The next prime is 221202121451. The reversal of 221202121424 is 424121202122.

It is a self number, because there is not a number n which added to its sum of digits gives 221202121424.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 841454 + ... + 1072589.

Almost surely, 2^221202121424 is an apocalyptic number.

It is an amenable number.

221202121424 is an abundant number, since it is smaller than the sum of its proper divisors (223101084208).

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

221202121424 is a wasteful number, since it uses less digits than its factorization.

221202121424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1914315 (or 1914309 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 221202121424 its reverse (424121202122), we get a palindrome (645323323546).

The spelling of 221202121424 in words is "two hundred twenty-one billion, two hundred two million, one hundred twenty-one thousand, four hundred twenty-four".