21221200101029 has 2 divisors, whose sum is σ = 21221200101030. Its totient is φ = 21221200101028.

The previous prime is 21221200100959. The next prime is 21221200101113. The reversal of 21221200101029 is 92010100212212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20196053976004 + 1025146125025 = 4494002^2 + 1012495^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221200101029 - 2³⁶ = 21152480624293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221200100995 and 21221200101013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221200101229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610600050514 + 10610600050515.

It is an arithmetic number, because the mean of its divisors is an integer number (10610600050515).

Almost surely, 2^{21221200101029} is an apocalyptic number.

It is an amenable number.

21221200101029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221200101029 is an equidigital number, since it uses as much as digits as its factorization.

21221200101029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 21221200101029 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred million, one hundred one thousand, twenty-nine".