21506211314126 has 32 divisors (see below), whose sum is σ = 40785878730240. Its totient is φ = 8261028669600.

The previous prime is 21506211314111. The next prime is 21506211314131. The reversal of 21506211314126 is 62141311260512.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 983444861 + ... + 983466728.

It is an arithmetic number, because the mean of its divisors is an integer number (1274558710320).

Almost surely, 2^{21506211314126} is an apocalyptic number.

21506211314126 is a deficient number, since it is larger than the sum of its proper divisors (19279667416114).

21506211314126 is a wasteful number, since it uses less digits than its factorization.

21506211314126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1966911680.

The product of its (nonzero) digits is 17280, while the sum is 35.

Adding to 21506211314126 its reverse (62141311260512), we get a palindrome (83647522574638).

The spelling of 21506211314126 in words is "twenty-one trillion, five hundred six billion, two hundred eleven million, three hundred fourteen thousand, one hundred twenty-six".