1051012021 has 2 divisors, whose sum is σ = 1051012022. Its totient is φ = 1051012020.

The previous prime is 1051012019. The next prime is 1051012057. The reversal of 1051012021 is 1202101501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 925011396 + 126000625 = 30414^2 + 11225^2 .

It is a cyclic number.

It is not a de Polignac number, because 1051012021 - 2¹ = 1051012019 is a prime.

It is a super-2 number, since 2×1051012021² = 2209252536573008882, which contains 22 as substring.

Together with 1051012019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1051011992 and 1051012010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1051012091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 525506010 + 525506011.

It is an arithmetic number, because the mean of its divisors is an integer number (525506011).

Almost surely, 2^1051012021 is an apocalyptic number.

It is an amenable number.

1051012021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1051012021 is an equidigital number, since it uses as much as digits as its factorization.

1051012021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 1051012021 is about 32419.3155541569. The cubic root of 1051012021 is about 1016.7227962322.

Adding to 1051012021 its reverse (1202101501), we get a palindrome (2253113522).

The spelling of 1051012021 in words is "one billion, fifty-one million, twelve thousand, twenty-one".