2021261957 has 16 divisors (see below), whose sum is σ = 2384605440. Its totient is φ = 1689038400.

The previous prime is 2021261951. The next prime is 2021261959. The reversal of 2021261957 is 7591621202.

It is a cyclic number.

It is not a de Polignac number, because 2021261957 - 2⁴ = 2021261941 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 (2021261951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4607 + ... + 63747.

It is an arithmetic number, because the mean of its divisors is an integer number (149037840).

Almost surely, 2^2021261957 is an apocalyptic number.

It is an amenable number.

2021261957 is a deficient number, since it is larger than the sum of its proper divisors (363343483).

2021261957 is a wasteful number, since it uses less digits than its factorization.

2021261957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59404.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 2021261957 is about 44958.4470038724. The cubic root of 2021261957 is about 1264.3700523916.

The spelling of 2021261957 in words is "two billion, twenty-one million, two hundred sixty-one thousand, nine hundred fifty-seven".