20121401 has 2 divisors, whose sum is σ = 20121402. Its totient is φ = 20121400.

The previous prime is 20121391. The next prime is 20121427. The reversal of 20121401 is 10412102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15054400 + 5067001 = 3880^2 + 2251^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121401 - 2⁶ = 20121337 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20121901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060700 + 10060701.

It is an arithmetic number, because the mean of its divisors is an integer number (10060701).

Almost surely, 2^20121401 is an apocalyptic number.

It is an amenable number.

20121401 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121401 is an equidigital number, since it uses as much as digits as its factorization.

20121401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 20121401 is about 4485.6884644389. The cubic root of 20121401 is about 271.9898758126.

Adding to 20121401 its reverse (10412102), we get a palindrome (30533503).

The spelling of 20121401 in words is "twenty million, one hundred twenty-one thousand, four hundred one".