21372656203 has 2 divisors, whose sum is σ = 21372656204. Its totient is φ = 21372656202.

The previous prime is 21372656083. The next prime is 21372656219. The reversal of 21372656203 is 30265627312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21372656203 is a prime.

It is not a weakly prime, because it can be changed into another prime (21372656233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10686328101 + 10686328102.

It is an arithmetic number, because the mean of its divisors is an integer number (10686328102).

Almost surely, 2^21372656203 is an apocalyptic number.

21372656203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21372656203 is an equidigital number, since it uses as much as digits as its factorization.

21372656203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 37.

The spelling of 21372656203 in words is "twenty-one billion, three hundred seventy-two million, six hundred fifty-six thousand, two hundred three".