1921321125 has 48 divisors (see below), whose sum is σ = 3475407936. Its totient is φ = 1021183200.

The previous prime is 1921321117. The next prime is 1921321133. The reversal of 1921321125 is 5211231291.

It is an interprime number because it is at equal distance from previous prime (1921321117) and next prime (1921321133).

It is not a de Polignac number, because 1921321125 - 2³ = 1921321117 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 342594 + ... + 348156.

It is an arithmetic number, because the mean of its divisors is an integer number (72404332).

Almost surely, 2^1921321125 is an apocalyptic number.

1921321125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1921321125 is a deficient number, since it is larger than the sum of its proper divisors (1554086811).

1921321125 is a wasteful number, since it uses less digits than its factorization.

1921321125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5891 (or 5878 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 1921321125 is about 43832.8772156243. The cubic root of 1921321125 is about 1243.1780094207.

The spelling of 1921321125 in words is "one billion, nine hundred twenty-one million, three hundred twenty-one thousand, one hundred twenty-five".