98919966421 has 4 divisors (see below), whose sum is σ = 99001249452. Its totient is φ = 98838683392.

The previous prime is 98919966407. The next prime is 98919966463. The reversal of 98919966421 is 12466991989.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70304522500 + 28615443921 = 265150^2 + 169161^2 .

It is a cyclic number.

It is not a de Polignac number, because 98919966421 - 2⁵ = 98919966389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (98919963421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40639690 + ... + 40642123.

It is an arithmetic number, because the mean of its divisors is an integer number (24750312363).

Almost surely, 2^98919966421 is an apocalyptic number.

It is an amenable number.

98919966421 is a deficient number, since it is larger than the sum of its proper divisors (81283031).

98919966421 is a wasteful number, since it uses less digits than its factorization.

98919966421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81283030.

The product of its digits is 15116544, while the sum is 64.

The spelling of 98919966421 in words is "ninety-eight billion, nine hundred nineteen million, nine hundred sixty-six thousand, four hundred twenty-one".