7001661021 has 8 divisors (see below), whose sum is σ = 9884697984. Its totient is φ = 4393199040.

The previous prime is 7001660993. The next prime is 7001661049. The reversal of 7001661021 is 1201661007.

It is an interprime number because it is at equal distance from previous prime (7001660993) and next prime (7001661049).

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

It is not a de Polignac number, because 7001661021 - 2⁷ = 7001660893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7001660982 and 7001661000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7001661091) 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, 68643685 + ... + 68643786.

It is an arithmetic number, because the mean of its divisors is an integer number (1235587248).

Almost surely, 2^7001661021 is an apocalyptic number.

It is an amenable number.

7001661021 is a deficient number, since it is larger than the sum of its proper divisors (2883036963).

7001661021 is a wasteful number, since it uses less digits than its factorization.

7001661021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137287491.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 7001661021 is about 83675.9285637154. The cubic root of 7001661021 is about 1913.0824764666.

The spelling of 7001661021 in words is "seven billion, one million, six hundred sixty-one thousand, twenty-one".