1490021921 has 2 divisors, whose sum is σ = 1490021922. Its totient is φ = 1490021920.

The previous prime is 1490021887. The next prime is 1490021969. The reversal of 1490021921 is 1291200941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1162810000 + 327211921 = 34100^2 + 18089^2 .

It is a cyclic number.

It is not a de Polignac number, because 1490021921 - 2¹⁴ = 1490005537 is a prime.

It is not a weakly prime, because it can be changed into another prime (1490026921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745010960 + 745010961.

It is an arithmetic number, because the mean of its divisors is an integer number (745010961).

Almost surely, 2^1490021921 is an apocalyptic number.

It is an amenable number.

1490021921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1490021921 is an equidigital number, since it uses as much as digits as its factorization.

1490021921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 1490021921 is about 38600.8020771590. The cubic root of 1490021921 is about 1142.1703603646.

The spelling of 1490021921 in words is "one billion, four hundred ninety million, twenty-one thousand, nine hundred twenty-one".