21111021033 has 16 divisors (see below), whose sum is σ = 28494520320. Its totient is φ = 13900855824.

The previous prime is 21111021031. The next prime is 21111021059. The reversal of 21111021033 is 33012011112.

It is a happy number.

It is not a de Polignac number, because 21111021033 - 2¹ = 21111021031 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21111021031) 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, 1242288 + ... + 1259166.

It is an arithmetic number, because the mean of its divisors is an integer number (1780907520).

Almost surely, 2^21111021033 is an apocalyptic number.

It is an amenable number.

21111021033 is a deficient number, since it is larger than the sum of its proper divisors (7383499287).

21111021033 is a wasteful number, since it uses less digits than its factorization.

21111021033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21988.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21111021033 its reverse (33012011112), we get a palindrome (54123032145).

The spelling of 21111021033 in words is "twenty-one billion, one hundred eleven million, twenty-one thousand, thirty-three".