1084720421 has 2 divisors, whose sum is σ = 1084720422. Its totient is φ = 1084720420.

The previous prime is 1084720397. The next prime is 1084720423. The reversal of 1084720421 is 1240274801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 962860900 + 121859521 = 31030^2 + 11039^2 .

It is a cyclic number.

It is not a de Polignac number, because 1084720421 - 2¹⁰ = 1084719397 is a prime.

Together with 1084720423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1084720423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 542360210 + 542360211.

It is an arithmetic number, because the mean of its divisors is an integer number (542360211).

Almost surely, 2^1084720421 is an apocalyptic number.

It is an amenable number.

1084720421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1084720421 is an equidigital number, since it uses as much as digits as its factorization.

1084720421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 1084720421 is about 32935.0940639313. The cubic root of 1084720421 is about 1027.4781744623.

The spelling of 1084720421 in words is "one billion, eighty-four million, seven hundred twenty thousand, four hundred twenty-one".