1021400521 has 2 divisors, whose sum is σ = 1021400522. Its totient is φ = 1021400520.

The previous prime is 1021400489. The next prime is 1021400551. The reversal of 1021400521 is 1250041201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 981255625 + 40144896 = 31325^2 + 6336^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021400521 - 2⁵ = 1021400489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021400495 and 1021400504.

It is not a weakly prime, because it can be changed into another prime (1021400551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510700260 + 510700261.

It is an arithmetic number, because the mean of its divisors is an integer number (510700261).

Almost surely, 2^1021400521 is an apocalyptic number.

It is an amenable number.

1021400521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021400521 is an equidigital number, since it uses as much as digits as its factorization.

1021400521 is an evil number, because the sum of its binary digits is even.

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

The square root of 1021400521 is about 31959.3573308350. The cubic root of 1021400521 is about 1007.0832165832.

Adding to 1021400521 its reverse (1250041201), we get a palindrome (2271441722).

The spelling of 1021400521 in words is "one billion, twenty-one million, four hundred thousand, five hundred twenty-one".