421612501 has 2 divisors, whose sum is σ = 421612502. Its totient is φ = 421612500.

The previous prime is 421612487. The next prime is 421612511. The reversal of 421612501 is 105216124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 273406225 + 148206276 = 16535^2 + 12174^2 .

It is a cyclic number.

It is not a de Polignac number, because 421612501 - 2¹⁷ = 421481429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421612511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210806250 + 210806251.

It is an arithmetic number, because the mean of its divisors is an integer number (210806251).

Almost surely, 2^421612501 is an apocalyptic number.

It is an amenable number.

421612501 is a deficient number, since it is larger than the sum of its proper divisors (1).

421612501 is an equidigital number, since it uses as much as digits as its factorization.

421612501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 421612501 is about 20533.2048399659. The cubic root of 421612501 is about 749.8444127628.

Adding to 421612501 its reverse (105216124), we get a palindrome (526828625).

The spelling of 421612501 in words is "four hundred twenty-one million, six hundred twelve thousand, five hundred one".