21101210012 has 6 divisors (see below), whose sum is σ = 36927117528. Its totient is φ = 10550605004.

The previous prime is 21101210003. The next prime is 21101210021. The reversal of 21101210012 is 21001210112.

It is an interprime number because it is at equal distance from previous prime (21101210003) and next prime (21101210021).

It is a super-2 number, since 2×21101210012² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21101209975 and 21101210002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2637651248 + ... + 2637651255.

It is an arithmetic number, because the mean of its divisors is an integer number (6154519588).

Almost surely, 2^21101210012 is an apocalyptic number.

It is an amenable number.

21101210012 is a deficient number, since it is larger than the sum of its proper divisors (15825907516).

21101210012 is a wasteful number, since it uses less digits than its factorization.

21101210012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5275302507 (or 5275302505 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21101210012 its reverse (21001210112), we get a palindrome (42102420124).

The spelling of 21101210012 in words is "twenty-one billion, one hundred one million, two hundred ten thousand, twelve".