21211212229 has 8 divisors (see below), whose sum is σ = 22332415680. Its totient is φ = 20090491200.

The previous prime is 21211212173. The next prime is 21211212233. The reversal of 21211212229 is 92221211212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21211212229 - 2¹³ = 21211204037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211512229) 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, 28537 + ... + 207934.

It is an arithmetic number, because the mean of its divisors is an integer number (2791551960).

Almost surely, 2^21211212229 is an apocalyptic number.

It is an amenable number.

21211212229 is a deficient number, since it is larger than the sum of its proper divisors (1121203451).

21211212229 is a wasteful number, since it uses less digits than its factorization.

21211212229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241211.

The product of its digits is 576, while the sum is 25.

The spelling of 21211212229 in words is "twenty-one billion, two hundred eleven million, two hundred twelve thousand, two hundred twenty-nine".