21620452146026 has 8 divisors (see below), whose sum is σ = 32435911524420. Its totient is φ = 10808481637888.

The previous prime is 21620452145993. The next prime is 21620452146037. The reversal of 21620452146026 is 62064125402612.

It can be written as a sum of positive squares in 2 ways, for example, as 21511053276001 + 109398870025 = 4638001^2 + 330755^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 872202071 + ... + 872226858.

Almost surely, 2^{21620452146026} is an apocalyptic number.

21620452146026 is a deficient number, since it is larger than the sum of its proper divisors (10815459378394).

21620452146026 is a wasteful number, since it uses less digits than its factorization.

21620452146026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744435128.

The product of its (nonzero) digits is 276480, while the sum is 41.

Adding to 21620452146026 its reverse (62064125402612), we get a palindrome (83684577548638).

The spelling of 21620452146026 in words is "twenty-one trillion, six hundred twenty billion, four hundred fifty-two million, one hundred forty-six thousand, twenty-six".