106720421 has 2 divisors, whose sum is σ = 106720422. Its totient is φ = 106720420.

The previous prime is 106720387. The next prime is 106720457. The reversal of 106720421 is 124027601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103530625 + 3189796 = 10175^2 + 1786^2 .

It is an emirp because it is prime and its reverse (124027601) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 106720421 - 2¹⁰ = 106719397 is a prime.

It is a super-2 number, since 2×106720421² = 22778496516834482, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (106720121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53360210 + 53360211.

It is an arithmetic number, because the mean of its divisors is an integer number (53360211).

Almost surely, 2^106720421 is an apocalyptic number.

It is an amenable number.

106720421 is a deficient number, since it is larger than the sum of its proper divisors (1).

106720421 is an equidigital number, since it uses as much as digits as its factorization.

106720421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 106720421 is about 10330.5576325772. The cubic root of 106720421 is about 474.3320932317.

The spelling of 106720421 in words is "one hundred six million, seven hundred twenty thousand, four hundred twenty-one".