21221121120037 has 2 divisors, whose sum is σ = 21221121120038. Its totient is φ = 21221121120036.

The previous prime is 21221121120029. The next prime is 21221121120139. The reversal of 21221121120037 is 73002112112212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14121955210561 + 7099165909476 = 3757919^2 + 2664426^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221121120037 - 2³ = 21221121120029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221121119993 and 21221121120020.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221121120007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610560560018 + 10610560560019.

It is an arithmetic number, because the mean of its divisors is an integer number (10610560560019).

Almost surely, 2^{21221121120037} is an apocalyptic number.

It is an amenable number.

21221121120037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221121120037 is an equidigital number, since it uses as much as digits as its factorization.

21221121120037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

Adding to 21221121120037 its reverse (73002112112212), we get a palindrome (94223233232249).

The spelling of 21221121120037 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred twenty thousand, thirty-seven".