2051431221521 has 8 divisors (see below), whose sum is σ = 2239642501824. Its totient is φ = 1863506196720.

The previous prime is 2051431221509. The next prime is 2051431221557. The reversal of 2051431221521 is 1251221341502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2051431221521 - 2²² = 2051427027217 is a prime.

It is a super-2 number, since 2×2051431221521² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2051431220521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71548886 + ... + 71577551.

It is an arithmetic number, because the mean of its divisors is an integer number (279955312728).

Almost surely, 2^{2051431221521} is an apocalyptic number.

It is an amenable number.

2051431221521 is a deficient number, since it is larger than the sum of its proper divisors (188211280303).

2051431221521 is a wasteful number, since it uses less digits than its factorization.

2051431221521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143127751.

The product of its (nonzero) digits is 4800, while the sum is 29.

The spelling of 2051431221521 in words is "two trillion, fifty-one billion, four hundred thirty-one million, two hundred twenty-one thousand, five hundred twenty-one".