21000010101 has 16 divisors (see below), whose sum is σ = 32057483904. Its totient is φ = 11978455104.

The previous prime is 21000010093. The next prime is 21000010103. The reversal of 21000010101 is 10101000012.

It is not a de Polignac number, because 21000010101 - 2³ = 21000010093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21000010101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000010103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 885970 + ... + 909363.

It is an arithmetic number, because the mean of its divisors is an integer number (2003592744).

Almost surely, 2^21000010101 is an apocalyptic number.

21000010101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21000010101 is a deficient number, since it is larger than the sum of its proper divisors (11057473803).

21000010101 is a wasteful number, since it uses less digits than its factorization.

21000010101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795900.

The product of its (nonzero) digits is 2, while the sum is 6.

Adding to 21000010101 its reverse (10101000012), we get a palindrome (31101010113).

The spelling of 21000010101 in words is "twenty-one billion, ten thousand, one hundred one".