81021001202102 has 32 divisors (see below), whose sum is σ = 134928471408192. Its totient is φ = 36245310274944.

The previous prime is 81021001202093. The next prime is 81021001202147. The reversal of 81021001202102 is 20120210012018.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159863753 + ... + 160369764.

It is an arithmetic number, because the mean of its divisors is an integer number (4216514731506).

Almost surely, 2^{81021001202102} is an apocalyptic number.

81021001202102 is a deficient number, since it is larger than the sum of its proper divisors (53907470206090).

81021001202102 is a wasteful number, since it uses less digits than its factorization.

81021001202102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320233832.

The product of its (nonzero) digits is 128, while the sum is 20.

The spelling of 81021001202102 in words is "eighty-one trillion, twenty-one billion, one million, two hundred two thousand, one hundred two".