1929142021 has 4 divisors (see below), whose sum is σ = 1937640672. Its totient is φ = 1920643372.

The previous prime is 1929142013. The next prime is 1929142037. The reversal of 1929142021 is 1202419291.

It is a happy number.

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 1929142021 - 2³ = 1929142013 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 (1929142051) 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, 4248985 + ... + 4249438.

It is an arithmetic number, because the mean of its divisors is an integer number (484410168).

Almost surely, 2^1929142021 is an apocalyptic number.

It is an amenable number.

1929142021 is a deficient number, since it is larger than the sum of its proper divisors (8498651).

1929142021 is an equidigital number, since it uses as much as digits as its factorization.

1929142021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8498650.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 1929142021 is about 43921.9992828195. Note that the first 3 decimals coincide. The cubic root of 1929142021 is about 1244.8625453212.

The spelling of 1929142021 in words is "one billion, nine hundred twenty-nine million, one hundred forty-two thousand, twenty-one".