1015020421 has 2 divisors, whose sum is σ = 1015020422. Its totient is φ = 1015020420.

The previous prime is 1015020367. The next prime is 1015020427. The reversal of 1015020421 is 1240205101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1002672225 + 12348196 = 31665^2 + 3514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1015020421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1015020395 and 1015020404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1015020427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 507510210 + 507510211.

It is an arithmetic number, because the mean of its divisors is an integer number (507510211).

Almost surely, 2^1015020421 is an apocalyptic number.

It is an amenable number.

1015020421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1015020421 is an equidigital number, since it uses as much as digits as its factorization.

1015020421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 1015020421 is about 31859.3851321710. The cubic root of 1015020421 is about 1004.9819459971.

Adding to 1015020421 its reverse (1240205101), we get a palindrome (2255225522).

The spelling of 1015020421 in words is "one billion, fifteen million, twenty thousand, four hundred twenty-one".