84687402121 has 15 divisors (see below), whose sum is σ = 98812728461. Its totient is φ = 72576979356.

The previous prime is 84687402101. The next prime is 84687402133. The reversal of 84687402121 is 12120478648.

The square root of 84687402121 is 291011.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 84687402121 - 2⁷ = 84687401993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84687402101) 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 14 ways as a sum of consecutive naturals, for example, 14256570 + ... + 14262508.

Almost surely, 2^84687402121 is an apocalyptic number.

84687402121 is the 291011-st square number.

84687402121 is the 145506-th centered octagonal number.

It is an amenable number.

84687402121 is a deficient number, since it is larger than the sum of its proper divisors (14125326340).

84687402121 is an frugal number, since it uses more digits than its factorization.

84687402121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11906 (or 5946 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 43.

The spelling of 84687402121 in words is "eighty-four billion, six hundred eighty-seven million, four hundred two thousand, one hundred twenty-one".