2151701621 has 8 divisors (see below), whose sum is σ = 2209421760. Its totient is φ = 2094689952.

The previous prime is 2151701597. The next prime is 2151701623. The reversal of 2151701621 is 1261071512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2151701621 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 (2151701623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170960 + ... + 183113.

It is an arithmetic number, because the mean of its divisors is an integer number (276177720).

Almost surely, 2^2151701621 is an apocalyptic number.

It is an amenable number.

2151701621 is a deficient number, since it is larger than the sum of its proper divisors (57720139).

2151701621 is a wasteful number, since it uses less digits than its factorization.

2151701621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354235.

The product of its (nonzero) digits is 840, while the sum is 26.

The square root of 2151701621 is about 46386.4378994551. The cubic root of 2151701621 is about 1291.0032899633.

The spelling of 2151701621 in words is "two billion, one hundred fifty-one million, seven hundred one thousand, six hundred twenty-one".