21001021098 has 8 divisors (see below), whose sum is σ = 42002042208. Its totient is φ = 7000340364.

The previous prime is 21001021091. The next prime is 21001021103. The reversal of 21001021098 is 89012010012.

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

21001021098 is an admirable number.

It is a super-2 number, since 2×21001021098² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21001021091) 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, 1750085086 + ... + 1750085097.

It is an arithmetic number, because the mean of its divisors is an integer number (5250255276).

Almost surely, 2^21001021098 is an apocalyptic number.

21001021098 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21001021098 is a wasteful number, since it uses less digits than its factorization.

21001021098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3500170188.

The product of its (nonzero) digits is 288, while the sum is 24.

The spelling of 21001021098 in words is "twenty-one billion, one million, twenty-one thousand, ninety-eight".