21213613220026 has 16 divisors (see below), whose sum is σ = 33699826972224. Its totient is φ = 9980619701184.

The previous prime is 21213613220021. The next prime is 21213613220071. The reversal of 21213613220026 is 62002231631212.

It is a self number, because there is not a number n which added to its sum of digits gives 21213613220026.

It is not an unprimeable number, because it can be changed into a prime (21213613220021) 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, 70382040 + ... + 70682803.

It is an arithmetic number, because the mean of its divisors is an integer number (2106239185764).

Almost surely, 2^{21213613220026} is an apocalyptic number.

21213613220026 is a deficient number, since it is larger than the sum of its proper divisors (12486213752198).

21213613220026 is a wasteful number, since it uses less digits than its factorization.

21213613220026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141069285.

The product of its (nonzero) digits is 10368, while the sum is 31.

Adding to 21213613220026 its reverse (62002231631212), we get a palindrome (83215844851238).

The spelling of 21213613220026 in words is "twenty-one trillion, two hundred thirteen billion, six hundred thirteen million, two hundred twenty thousand, twenty-six".