2021685572 has 6 divisors (see below), whose sum is σ = 3537949758. Its totient is φ = 1010842784.

The previous prime is 2021685571. The next prime is 2021685581. The reversal of 2021685572 is 2755861202.

It can be written as a sum of positive squares in only one way, i.e., 1989695236 + 31990336 = 44606^2 + 5656^2 .

It is not an unprimeable number, because it can be changed into a prime (2021685571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252710693 + ... + 252710700.

It is an arithmetic number, because the mean of its divisors is an integer number (589658293).

Almost surely, 2^2021685572 is an apocalyptic number.

It is an amenable number.

2021685572 is a deficient number, since it is larger than the sum of its proper divisors (1516264186).

2021685572 is a wasteful number, since it uses less digits than its factorization.

2021685572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505421397 (or 505421395 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 2021685572 is about 44963.1579406963. The cubic root of 2021685572 is about 1264.4583748882.

The spelling of 2021685572 in words is "two billion, twenty-one million, six hundred eighty-five thousand, five hundred seventy-two".