21010541642 has 32 divisors (see below), whose sum is σ = 32379042384. Its totient is φ = 10221120000.

The previous prime is 21010541627. The next prime is 21010541663. The reversal of 21010541642 is 24614501012.

It can be written as a sum of positive squares in 8 ways, for example, as 10549138681 + 10461402961 = 102709^2 + 102281^2 .

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, 11665142 + ... + 11666942.

Almost surely, 2^21010541642 is an apocalyptic number.

21010541642 is a deficient number, since it is larger than the sum of its proper divisors (11368500742).

21010541642 is a wasteful number, since it uses less digits than its factorization.

21010541642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2714.

The product of its (nonzero) digits is 1920, while the sum is 26.

The spelling of 21010541642 in words is "twenty-one billion, ten million, five hundred forty-one thousand, six hundred forty-two".