21501212212631 has 2 divisors, whose sum is σ = 21501212212632. Its totient is φ = 21501212212630.

The previous prime is 21501212212607. The next prime is 21501212212657. The reversal of 21501212212631 is 13621221210512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21501212212631 - 2³⁴ = 21484032343447 is a prime.

It is a super-2 number, since 2×21501212212631² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21501212212594 and 21501212212603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21501212212231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10750606106315 + 10750606106316.

It is an arithmetic number, because the mean of its divisors is an integer number (10750606106316).

Almost surely, 2^{21501212212631} is an apocalyptic number.

21501212212631 is a deficient number, since it is larger than the sum of its proper divisors (1).

21501212212631 is an equidigital number, since it uses as much as digits as its factorization.

21501212212631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The spelling of 21501212212631 in words is "twenty-one trillion, five hundred one billion, two hundred twelve million, two hundred twelve thousand, six hundred thirty-one".