2621210121251 has 2 divisors, whose sum is σ = 2621210121252. Its totient is φ = 2621210121250.

The previous prime is 2621210121221. The next prime is 2621210121301. The reversal of 2621210121251 is 1521210121262.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2621210121251 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2621210121251.

It is not a weakly prime, because it can be changed into another prime (2621210121221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1310605060625 + 1310605060626.

It is an arithmetic number, because the mean of its divisors is an integer number (1310605060626).

Almost surely, 2^{2621210121251} is an apocalyptic number.

2621210121251 is a deficient number, since it is larger than the sum of its proper divisors (1).

2621210121251 is an equidigital number, since it uses as much as digits as its factorization.

2621210121251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 26.

The spelling of 2621210121251 in words is "two trillion, six hundred twenty-one billion, two hundred ten million, one hundred twenty-one thousand, two hundred fifty-one".