1240223021 has 4 divisors (see below), whose sum is σ = 1240465344. Its totient is φ = 1239980700.

The previous prime is 1240223003. The next prime is 1240223027. The reversal of 1240223021 is 1203220421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1240223021 - 2¹⁴ = 1240206637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240223027) 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, 113315 + ... + 123776.

It is an arithmetic number, because the mean of its divisors is an integer number (310116336).

Almost surely, 2^1240223021 is an apocalyptic number.

It is an amenable number.

1240223021 is a deficient number, since it is larger than the sum of its proper divisors (242323).

1240223021 is an equidigital number, since it uses as much as digits as its factorization.

1240223021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242322.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1240223021 is about 35216.8002663502. The cubic root of 1240223021 is about 1074.4014756569.

Adding to 1240223021 its reverse (1203220421), we get a palindrome (2443443442).

The spelling of 1240223021 in words is "one billion, two hundred forty million, two hundred twenty-three thousand, twenty-one".