21901941362401 has 3 divisors (see below), whose sum is σ = 21901946042353. Its totient is φ = 21901936682450.

The previous prime is 21901941362387. The next prime is 21901941362491. The reversal of 21901941362401 is 10426314910912.

The square root of 21901941362401 is 4679951.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 21901941362401 - 2⁹ = 21901941361889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21901941362491) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2339976 + ... + 7019926.

Almost surely, 2^{21901941362401} is an apocalyptic number.

21901941362401 is the 4679951-st square number.

21901941362401 is the 2339976-th centered octagonal number.

It is an amenable number.

21901941362401 is a deficient number, since it is larger than the sum of its proper divisors (4679952).

21901941362401 is an frugal number, since it uses more digits than its factorization.

21901941362401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9359902 (or 4679951 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 21901941362401 in words is "twenty-one trillion, nine hundred one billion, nine hundred forty-one million, three hundred sixty-two thousand, four hundred one".