21121031983 has 2 divisors, whose sum is σ = 21121031984. Its totient is φ = 21121031982.

The previous prime is 21121031969. The next prime is 21121031993. The reversal of 21121031983 is 38913012112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21121031983 - 2²⁹ = 20584161071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121031993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560515991 + 10560515992.

It is an arithmetic number, because the mean of its divisors is an integer number (10560515992).

Almost surely, 2^21121031983 is an apocalyptic number.

21121031983 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121031983 is an equidigital number, since it uses as much as digits as its factorization.

21121031983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 31.

The spelling of 21121031983 in words is "twenty-one billion, one hundred twenty-one million, thirty-one thousand, nine hundred eighty-three".