1375623021 has 16 divisors (see below), whose sum is σ = 1884193920. Its totient is φ = 892193280.

The previous prime is 1375623001. The next prime is 1375623061. The reversal of 1375623021 is 1203265731.

It is not a de Polignac number, because 1375623021 - 2⁶ = 1375622957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1375623021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1375623001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28581 + ... + 59733.

It is an arithmetic number, because the mean of its divisors is an integer number (117762120).

Almost surely, 2^1375623021 is an apocalyptic number.

It is an amenable number.

1375623021 is a deficient number, since it is larger than the sum of its proper divisors (508570899).

1375623021 is a wasteful number, since it uses less digits than its factorization.

1375623021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31556.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 1375623021 is about 37089.3922975290. The cubic root of 1375623021 is about 1112.1579697792.

Adding to 1375623021 its reverse (1203265731), we get a palindrome (2578888752).

The spelling of 1375623021 in words is "one billion, three hundred seventy-five million, six hundred twenty-three thousand, twenty-one".