2021198706431 has 8 divisors (see below), whose sum is σ = 2023770633360. Its totient is φ = 2018627255232.

The previous prime is 2021198706419. The next prime is 2021198706473. The reversal of 2021198706431 is 1346078911202.

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-2021198706431 is a prime.

It is a super-2 number, since 2×2021198706431² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021198706931) 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, 8808251 + ... + 9034803.

It is an arithmetic number, because the mean of its divisors is an integer number (252971329170).

Almost surely, 2^{2021198706431} is an apocalyptic number.

2021198706431 is a deficient number, since it is larger than the sum of its proper divisors (2571926929).

2021198706431 is a wasteful number, since it uses less digits than its factorization.

2021198706431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237865.

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 2021198706431 in words is "two trillion, twenty-one billion, one hundred ninety-eight million, seven hundred six thousand, four hundred thirty-one".