121201020421400 has 96 divisors (see below), whose sum is σ = 284189448367440. Its totient is φ = 48069687912960.

The previous prime is 121201020421343. The next prime is 121201020421499. The reversal of 121201020421400 is 4124020102121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6294767 + ... + 16793633.

Almost surely, 2^{121201020421400} is an apocalyptic number.

121201020421400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121201020421400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142094724183720).

121201020421400 is an abundant number, since it is smaller than the sum of its proper divisors (162988427946040).

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

121201020421400 is a wasteful number, since it uses less digits than its factorization.

121201020421400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10499373 (or 10499364 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 121201020421400 its reverse (4124020102121), we get a palindrome (125325040523521).

The spelling of 121201020421400 in words is "one hundred twenty-one trillion, two hundred one billion, twenty million, four hundred twenty-one thousand, four hundred".