1368123921 has 24 divisors (see below), whose sum is σ = 2036923200. Its totient is φ = 884469600.

The previous prime is 1368123917. The next prime is 1368123949. The reversal of 1368123921 is 1293218631.

It is not a de Polignac number, because 1368123921 - 2² = 1368123917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1368123901) 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, 21430 + ... + 56528.

It is an arithmetic number, because the mean of its divisors is an integer number (84871800).

Almost surely, 2^1368123921 is an apocalyptic number.

It is an amenable number.

1368123921 is a deficient number, since it is larger than the sum of its proper divisors (668799279).

1368123921 is a wasteful number, since it uses less digits than its factorization.

1368123921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35237 (or 35234 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 1368123921 is about 36988.1591999386. The cubic root of 1368123921 is about 1110.1333392291.

The spelling of 1368123921 in words is "one billion, three hundred sixty-eight million, one hundred twenty-three thousand, nine hundred twenty-one".