69812021 has 2 divisors, whose sum is σ = 69812022. Its totient is φ = 69812020.

The previous prime is 69812003. The next prime is 69812051. The reversal of 69812021 is 12021896.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65448100 + 4363921 = 8090^2 + 2089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-69812021 is a prime.

It is a super-2 number, since 2×69812021² = 9747436552208882, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69812051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34906010 + 34906011.

It is an arithmetic number, because the mean of its divisors is an integer number (34906011).

Almost surely, 2^69812021 is an apocalyptic number.

It is an amenable number.

69812021 is a deficient number, since it is larger than the sum of its proper divisors (1).

69812021 is an equidigital number, since it uses as much as digits as its factorization.

69812021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 69812021 is about 8355.3588193446. The cubic root of 69812021 is about 411.7592873128.

The spelling of 69812021 in words is "sixty-nine million, eight hundred twelve thousand, twenty-one".