21000100134 has 16 divisors (see below), whose sum is σ = 45230985072. Its totient is φ = 6461569248.

The previous prime is 21000100129. The next prime is 21000100139. The reversal of 21000100134 is 43100100012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21000100129) and next prime (21000100139).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000100139) 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, 134615949 + ... + 134616104.

It is an arithmetic number, because the mean of its divisors is an integer number (2826936567).

Almost surely, 2^21000100134 is an apocalyptic number.

21000100134 is an abundant number, since it is smaller than the sum of its proper divisors (24230884938).

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

21000100134 is a wasteful number, since it uses less digits than its factorization.

21000100134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269232071.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21000100134 its reverse (43100100012), we get a palindrome (64100200146).

The spelling of 21000100134 in words is "twenty-one billion, one hundred thousand, one hundred thirty-four".