1021214023541 has 4 divisors (see below), whose sum is σ = 1022535129132. Its totient is φ = 1019892917952.

The previous prime is 1021214023513. The next prime is 1021214023549. The reversal of 1021214023541 is 1453204121201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 195051189316 + 826162834225 = 441646^2 + 908935^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021214023541 - 2¹⁴ = 1021214007157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021214023541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021214023549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 660551636 + ... + 660553181.

It is an arithmetic number, because the mean of its divisors is an integer number (255633782283).

Almost surely, 2^{1021214023541} is an apocalyptic number.

It is an amenable number.

1021214023541 is a deficient number, since it is larger than the sum of its proper divisors (1321105591).

1021214023541 is an equidigital number, since it uses as much as digits as its factorization.

1021214023541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321105590.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 1021214023541 its reverse (1453204121201), we get a palindrome (2474418144742).

The spelling of 1021214023541 in words is "one trillion, twenty-one billion, two hundred fourteen million, twenty-three thousand, five hundred forty-one".