21276042634 has 16 divisors (see below), whose sum is σ = 39788963136. Its totient is φ = 8289367200.

The previous prime is 21276042617. The next prime is 21276042701. The reversal of 21276042634 is 43624067212.

It is a junction number, because it is equal to n+sod(n) for n = 21276042593 and 21276042602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69077907 + ... + 69078214.

It is an arithmetic number, because the mean of its divisors is an integer number (2486810196).

Almost surely, 2^21276042634 is an apocalyptic number.

21276042634 is a deficient number, since it is larger than the sum of its proper divisors (18512920502).

21276042634 is a wasteful number, since it uses less digits than its factorization.

21276042634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138156141.

The product of its (nonzero) digits is 96768, while the sum is 37.

The spelling of 21276042634 in words is "twenty-one billion, two hundred seventy-six million, forty-two thousand, six hundred thirty-four".