21101001030 has 24 divisors (see below), whose sum is σ = 54862602912. Its totient is φ = 5626933584.

The previous prime is 21101001017. The next prime is 21101001037. The reversal of 21101001030 is 3010010112.

It is a super-2 number, since 2×21101001030² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101001037) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117227694 + ... + 117227873.

It is an arithmetic number, because the mean of its divisors is an integer number (2285941788).

Almost surely, 2^21101001030 is an apocalyptic number.

21101001030 is an abundant number, since it is smaller than the sum of its proper divisors (33761601882).

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

21101001030 is a wasteful number, since it uses less digits than its factorization.

21101001030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234455580 (or 234455577 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

Adding to 21101001030 its reverse (3010010112), we get a palindrome (24111011142).

The spelling of 21101001030 in words is "twenty-one billion, one hundred one million, one thousand, thirty".