2121403101401 has 4 divisors (see below), whose sum is σ = 2121687593652. Its totient is φ = 2121118609152.

The previous prime is 2121403101397. The next prime is 2121403101431. The reversal of 2121403101401 is 1041013041212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1493467305625 + 627935795776 = 1222075^2 + 792424^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121403101401 - 2² = 2121403101397 is a prime.

It is a super-2 number, since 2×2121403101401² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121403101431) 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, 142234940 + ... + 142249853.

It is an arithmetic number, because the mean of its divisors is an integer number (530421898413).

Almost surely, 2^{2121403101401} is an apocalyptic number.

It is an amenable number.

2121403101401 is a deficient number, since it is larger than the sum of its proper divisors (284492251).

2121403101401 is an equidigital number, since it uses as much as digits as its factorization.

2121403101401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284492250.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 2121403101401 its reverse (1041013041212), we get a palindrome (3162416142613).

The spelling of 2121403101401 in words is "two trillion, one hundred twenty-one billion, four hundred three million, one hundred one thousand, four hundred one".