1921025052 has 48 divisors (see below), whose sum is σ = 5115052320. Its totient is φ = 623033856.

The previous prime is 1921025009. The next prime is 1921025059. The reversal of 1921025052 is 2505201291.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921025059) 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, 236373 + ... + 244364.

It is an arithmetic number, because the mean of its divisors is an integer number (106563590).

Almost surely, 2^1921025052 is an apocalyptic number.

1921025052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1921025052 is an abundant number, since it is smaller than the sum of its proper divisors (3194027268).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1921025052 is a wasteful number, since it uses less digits than its factorization.

1921025052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480787 (or 480779 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 1921025052 is about 43829.4997918069. The cubic root of 1921025052 is about 1243.1141487875.

The spelling of 1921025052 in words is "one billion, nine hundred twenty-one million, twenty-five thousand, fifty-two".