2051521043722 has 4 divisors (see below), whose sum is σ = 3077281565586. Its totient is φ = 1025760521860.

The previous prime is 2051521043683. The next prime is 2051521043729. The reversal of 2051521043722 is 2273401251502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1407143985361 + 644377058361 = 1186231^2 + 802731^2 .

It is a super-2 number, since 2×2051521043722² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2051521043729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512880260929 + ... + 512880260932.

Almost surely, 2^{2051521043722} is an apocalyptic number.

2051521043722 is a deficient number, since it is larger than the sum of its proper divisors (1025760521864).

2051521043722 is a wasteful number, since it uses less digits than its factorization.

2051521043722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025760521863.

The product of its (nonzero) digits is 33600, while the sum is 34.

The spelling of 2051521043722 in words is "two trillion, fifty-one billion, five hundred twenty-one million, forty-three thousand, seven hundred twenty-two".