1552440021 has 32 divisors (see below), whose sum is σ = 2294160000. Its totient is φ = 925966080.

The previous prime is 1552440007. The next prime is 1552440047. The reversal of 1552440021 is 1200442551.

It is not a de Polignac number, because 1552440021 - 2⁵ = 1552439989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1552439973 and 1552440000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1552440091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 563355 + ... + 566103.

It is an arithmetic number, because the mean of its divisors is an integer number (71692500).

Almost surely, 2^1552440021 is an apocalyptic number.

1552440021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1552440021 is a deficient number, since it is larger than the sum of its proper divisors (741719979).

1552440021 is a wasteful number, since it uses less digits than its factorization.

1552440021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3029.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 1552440021 is about 39401.0154818375. The cubic root of 1552440021 is about 1157.9014826357.

Adding to 1552440021 its reverse (1200442551), we get a palindrome (2752882572).

The spelling of 1552440021 in words is "one billion, five hundred fifty-two million, four hundred forty thousand, twenty-one".