21122001606653 has 32 divisors (see below), whose sum is σ = 22714482706560. Its totient is φ = 19579706415360.

The previous prime is 21122001606637. The next prime is 21122001606659. The reversal of 21122001606653 is 35660610022112.

It is a cyclic number.

It is not a de Polignac number, because 21122001606653 - 2⁴ = 21122001606637 is a prime.

It is a super-2 number, since 2×21122001606653² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122001606659) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 660810650 + ... + 660842612.

It is an arithmetic number, because the mean of its divisors is an integer number (709827584580).

Almost surely, 2^{21122001606653} is an apocalyptic number.

It is an amenable number.

21122001606653 is a deficient number, since it is larger than the sum of its proper divisors (1592481099907).

21122001606653 is a wasteful number, since it uses less digits than its factorization.

21122001606653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33789.

The product of its (nonzero) digits is 25920, while the sum is 35.

Adding to 21122001606653 its reverse (35660610022112), we get a palindrome (56782611628765).

The spelling of 21122001606653 in words is "twenty-one trillion, one hundred twenty-two billion, one million, six hundred six thousand, six hundred fifty-three".