21012222213 has 6 divisors (see below), whose sum is σ = 30350987654. Its totient is φ = 14008148136.

The previous prime is 21012222193. The next prime is 21012222221. The reversal of 21012222213 is 31222221012.

It can be written as a sum of positive squares in only one way, i.e., 13475030724 + 7537191489 = 116082^2 + 86817^2 .

It is not a de Polignac number, because 21012222213 - 2¹³ = 21012214021 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 (21012227213) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1167345670 + ... + 1167345687.

Almost surely, 2^21012222213 is an apocalyptic number.

It is an amenable number.

21012222213 is a deficient number, since it is larger than the sum of its proper divisors (9338765441).

21012222213 is a wasteful number, since it uses less digits than its factorization.

21012222213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334691363 (or 2334691360 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21012222213 its reverse (31222221012), we get a palindrome (52234443225).

The spelling of 21012222213 in words is "twenty-one billion, twelve million, two hundred twenty-two thousand, two hundred thirteen".