21230135212 has 96 divisors (see below), whose sum is σ = 45341856000. Its totient is φ = 8564640000.

The previous prime is 21230135197. The next prime is 21230135233. The reversal of 21230135212 is 21253103212.

It is a super-2 number, since 2×21230135212² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4161039 + ... + 4166137.

It is an arithmetic number, because the mean of its divisors is an integer number (472311000).

Almost surely, 2^21230135212 is an apocalyptic number.

21230135212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21230135212 is an abundant number, since it is smaller than the sum of its proper divisors (24111720788).

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

21230135212 is a wasteful number, since it uses less digits than its factorization.

21230135212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5407 (or 5405 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 21230135212 its reverse (21253103212), we get a palindrome (42483238424).

The spelling of 21230135212 in words is "twenty-one billion, two hundred thirty million, one hundred thirty-five thousand, two hundred twelve".