2157021069 has 8 divisors (see below), whose sum is σ = 3286889280. Its totient is φ = 1232583456.

The previous prime is 2157021067. The next prime is 2157021071. The reversal of 2157021069 is 9601207512.

It is an interprime number because it is at equal distance from previous prime (2157021067) and next prime (2157021071).

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

It is not a de Polignac number, because 2157021069 - 2¹ = 2157021067 is a prime.

It is a super-2 number, since 2×2157021069² = 9305479784219805522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157021067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51357624 + ... + 51357665.

It is an arithmetic number, because the mean of its divisors is an integer number (410861160).

Almost surely, 2^2157021069 is an apocalyptic number.

It is an amenable number.

2157021069 is a deficient number, since it is larger than the sum of its proper divisors (1129868211).

2157021069 is a wasteful number, since it uses less digits than its factorization.

2157021069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102715299.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 2157021069 is about 46443.7409023003. The cubic root of 2157021069 is about 1292.0662894879.

The spelling of 2157021069 in words is "two billion, one hundred fifty-seven million, twenty-one thousand, sixty-nine".