21123516641034 has 64 divisors (see below), whose sum is σ = 44338424232960. Its totient is φ = 6700750479360.

The previous prime is 21123516640969. The next prime is 21123516641053. The reversal of 21123516641034 is 43014661532112.

It is a junction number, because it is equal to n+sod(n) for n = 21123516640983 and 21123516641001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2267602 + ... + 6883970.

It is an arithmetic number, because the mean of its divisors is an integer number (692787878640).

Almost surely, 2^{21123516641034} is an apocalyptic number.

21123516641034 is an abundant number, since it is smaller than the sum of its proper divisors (23214907591926).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21123516641034 is a wasteful number, since it uses less digits than its factorization.

21123516641034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4616815.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 21123516641034 in words is "twenty-one trillion, one hundred twenty-three billion, five hundred sixteen million, six hundred forty-one thousand, thirty-four".