21123101011302 has 72 divisors (see below), whose sum is σ = 48663599985000. Its totient is φ = 6620536201728.

The previous prime is 21123101011283. The next prime is 21123101011333. The reversal of 21123101011302 is 20311010132112.

21123101011302 is a `hidden beast` number, since 21 + 12 + 310 + 10 + 11 + 302 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3521449 + ... + 7392347.

It is an arithmetic number, because the mean of its divisors is an integer number (675883333125).

Almost surely, 2^{21123101011302} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21123101011302, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24331799992500).

21123101011302 is an abundant number, since it is smaller than the sum of its proper divisors (27540498973698).

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

21123101011302 is a wasteful number, since it uses less digits than its factorization.

21123101011302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3871990 (or 3871970 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21123101011302 its reverse (20311010132112), we get a palindrome (41434111143414).

The spelling of 21123101011302 in words is "twenty-one trillion, one hundred twenty-three billion, one hundred one million, eleven thousand, three hundred two".