21235452670 has 32 divisors (see below), whose sum is σ = 39209365440. Its totient is φ = 8275733760.

The previous prime is 21235452659. The next prime is 21235452677. The reversal of 21235452670 is 7625453212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21235452677) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 269776 + ... + 339484.

It is an arithmetic number, because the mean of its divisors is an integer number (1225292670).

Almost surely, 2^21235452670 is an apocalyptic number.

21235452670 is a deficient number, since it is larger than the sum of its proper divisors (17973912770).

21235452670 is a wasteful number, since it uses less digits than its factorization.

21235452670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70500.

The product of its (nonzero) digits is 100800, while the sum is 37.

The spelling of 21235452670 in words is "twenty-one billion, two hundred thirty-five million, four hundred fifty-two thousand, six hundred seventy".