1021401243 has 24 divisors (see below), whose sum is σ = 1536608736. Its totient is φ = 653184000.

The previous prime is 1021401211. The next prime is 1021401287. The reversal of 1021401243 is 3421041201.

1021401243 is a `hidden beast` number, since 1 + 0 + 21 + 401 + 243 = 666.

It is not a de Polignac number, because 1021401243 - 2⁵ = 1021401211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1021401343) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2043 + ... + 45243.

It is an arithmetic number, because the mean of its divisors is an integer number (64025364).

Almost surely, 2^1021401243 is an apocalyptic number.

1021401243 is a deficient number, since it is larger than the sum of its proper divisors (515207493).

1021401243 is a wasteful number, since it uses less digits than its factorization.

1021401243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43315 (or 43312 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1021401243 is about 31959.3686264294. The cubic root of 1021401243 is about 1007.0834538763.

Adding to 1021401243 its reverse (3421041201), we get a palindrome (4442442444).

The spelling of 1021401243 in words is "one billion, twenty-one million, four hundred one thousand, two hundred forty-three".