21000012012022 has 4 divisors (see below), whose sum is σ = 31500018018036. Its totient is φ = 10500006006010.

The previous prime is 21000012011999. The next prime is 21000012012037. The reversal of 21000012012022 is 22021021000012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21000012011993 and 21000012012011.

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, 5250003003004 + ... + 5250003003007.

It is an arithmetic number, because the mean of its divisors is an integer number (7875004504509).

Almost surely, 2^{21000012012022} is an apocalyptic number.

21000012012022 is a deficient number, since it is larger than the sum of its proper divisors (10500006006014).

21000012012022 is a wasteful number, since it uses less digits than its factorization.

21000012012022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10500006006013.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21000012012022 its reverse (22021021000012), we get a palindrome (43021033012034).

The spelling of 21000012012022 in words is "twenty-one trillion, twelve million, twelve thousand, twenty-two".