21011201212 has 6 divisors (see below), whose sum is σ = 36769602128. Its totient is φ = 10505600604.

The previous prime is 21011201209. The next prime is 21011201231. The reversal of 21011201212 is 21210211012.

It is a junction number, because it is equal to n+sod(n) for n = 21011201192 and 21011201201.

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, 2626400148 + ... + 2626400155.

Almost surely, 2^21011201212 is an apocalyptic number.

It is an amenable number.

21011201212 is a deficient number, since it is larger than the sum of its proper divisors (15758400916).

21011201212 is a wasteful number, since it uses less digits than its factorization.

21011201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5252800307 (or 5252800305 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21011201212 its reverse (21210211012), we get a palindrome (42221412224).

The spelling of 21011201212 in words is "twenty-one billion, eleven million, two hundred one thousand, two hundred twelve".