21072698050 has 12 divisors (see below), whose sum is σ = 39195218466. Its totient is φ = 8429079200.

The previous prime is 21072698029. The next prime is 21072698057. The reversal of 21072698050 is 5089627012.

It can be written as a sum of positive squares in 3 ways, for example, as 11841139489 + 9231558561 = 108817^2 + 96081^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21072697994 and 21072698012.

It is not an unprimeable number, because it can be changed into a prime (21072698057) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 210726931 + ... + 210727030.

Almost surely, 2^21072698050 is an apocalyptic number.

21072698050 is a deficient number, since it is larger than the sum of its proper divisors (18122520416).

21072698050 is a wasteful number, since it uses less digits than its factorization.

21072698050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421453973 (or 421453968 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 21072698050 in words is "twenty-one billion, seventy-two million, six hundred ninety-eight thousand, fifty".