2921051781 has 16 divisors (see below), whose sum is σ = 4382265600. Its totient is φ = 1922716224.

The previous prime is 2921051687. The next prime is 2921051789. The reversal of 2921051781 is 1871501292.

It is a happy number.

It is not a de Polignac number, because 2921051781 - 2¹⁸ = 2920789637 is a prime.

It is a super-2 number, since 2×2921051781² = 17065087014566543922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2921051789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 682596 + ... + 686861.

It is an arithmetic number, because the mean of its divisors is an integer number (273891600).

Almost surely, 2^2921051781 is an apocalyptic number.

It is an amenable number.

2921051781 is a deficient number, since it is larger than the sum of its proper divisors (1461213819).

2921051781 is a wasteful number, since it uses less digits than its factorization.

2921051781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1369545 (or 1369539 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 36.

The square root of 2921051781 is about 54046.7555085409. The cubic root of 2921051781 is about 1429.4854916283.

The spelling of 2921051781 in words is "two billion, nine hundred twenty-one million, fifty-one thousand, seven hundred eighty-one".